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apnic-089-v004.txt |
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apnic-089-v005.txt |
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APNIC Document identity |
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APNIC Document identity |
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Title: IPv6 Address Allocation and Assignment Policy |
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Title: IPv6 Address Allocation and Assignment Policy |
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Short title: ipv6-address-policy |
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Short title: ipv6-address-policy |
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Document ref: APNIC-089 |
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Document ref: APNIC-089 |
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Version: 004 |
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Version: 005 |
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Date of original publication: 1 July 2002 |
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Date of original publication: 1 July 2002 |
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Date of this version: 15 January 2007 |
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Date of this version: 19 March 2007 |
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Review scheduled: n/a |
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Review scheduled: n/a |
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Obsoletes: Previous versions |
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Obsoletes: Previous versions |
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Status: Obsolete |
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Status: Obsolete |
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Comments: n/a |
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Comments: n/a |
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IPv6 Address Allocation and Assignment Policy |
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IPv6 Address Allocation and Assignment Policy |
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Status of this Memo |
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Status of this Memo |
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skipping to change at line 102 |
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5.4.1. Assignment address space size |
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5.4.1. Assignment address space size |
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5.4.2. Assignment of multiple /48s to a single end site |
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5.4.2. Assignment of multiple /48s to a single end site |
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5.4.3. Assignment to operator’s infrastructure |
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5.4.3. Assignment to operator’s infrastructure |
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5.5. Registration |
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5.5. Registration |
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5.6. Reverse lookup |
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5.6. Reverse lookup |
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5.7. Existing IPv6 address space holders |
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5.7. Existing IPv6 address space holders |
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5.8. Assignments to IXPs and critical infrastructure |
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5.8. Portable assignments |
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5.8.1. Internet Exchange Points |
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5.8.1. Small multihoming assignments |
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5.8.2. Critical infrastructure |
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5.8.2. Internet Exchange Points |
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5.8.3. Critical infrastructure |
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6. References |
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6. References |
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7. Appendix A: HD-Ratio |
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7. Appendix A: HD-Ratio |
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8. Appendix B: Background information |
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8. Appendix B: Background information |
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8.1. Background |
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8.1. Background |
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8.2. Why a joint policy |
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8.2. Why a joint policy |
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8.3. The size of IPv6’s address space |
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8.3. The size of IPv6’s address space |
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document are intended to be adopted by each registry. However, |
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document are intended to be adopted by each registry. However, |
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adoption of this document does not preclude local variations in each |
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adoption of this document does not preclude local variations in each |
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region or area. |
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region or area. |
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[RFC2373, RFC2373bis] designate 2000::/3 to be global unicast address |
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[RFC2373, RFC2373bis] designate 2000::/3 to be global unicast address |
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space that IANA may allocate to the RIRs. In accordance with |
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space that IANA may allocate to the RIRs. In accordance with |
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[RFC2928, RFC2373bis, IAB-Request], IANA has allocated initial ranges |
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[RFC2928, RFC2373bis, IAB-Request], IANA has allocated initial ranges |
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of global unicast IPv6 address space from the 2001::/16 address block |
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of global unicast IPv6 address space from the 2001::/16 address block |
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to the existing RIRs. This document concerns the initial and |
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to the existing RIRs. This document concerns the initial and |
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subsequent allocations of the 2000::/3 unicast address space, for |
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subsequent allocations of the 2000::/3 unicast address space, for |
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which RIRs formulate allocation and assignment policies. Because end |
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which RIRs formulate allocation and assignment policies. |
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sites will generally be given /48 assignments [RFC 3177, RIRs- |
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on-48s], the particular emphasis of this document is on policies |
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relating the bits within 2000::/3 to the left of the /48 boundary. |
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However, since some end sites will receive /64 and /128 assignments, |
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all bits to the left of /64 are in scope. |
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This policy is considered to be an interim policy. It will be |
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This policy is considered to be an interim policy. It will be |
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reviewed in the future, subject to greater experience in the |
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reviewed in the future, subject to greater experience in the |
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administration of IPv6. |
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administration of IPv6. |
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2. Definitions |
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2. Definitions |
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[note: some of these definitions will be replaced by definitions from |
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[note: some of these definitions will be replaced by definitions from |
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other RIR documents in order to be more consistent.] |
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other RIR documents in order to be more consistent.] |
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skipping to change at line 228 |
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2.6. Assign |
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2.6. Assign |
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To assign means to delegate address space to an ISP or end-user, for |
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To assign means to delegate address space to an ISP or end-user, for |
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specific use within the Internet infrastructure they operate. |
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specific use within the Internet infrastructure they operate. |
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Assignments must only be made for specific purposes documented by |
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Assignments must only be made for specific purposes documented by |
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specific organizations and are not to be sub-assigned to other |
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specific organizations and are not to be sub-assigned to other |
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parties. |
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parties. |
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2.7. Utilization |
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2.7. Utilization |
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Unlike IPv4, IPv6 is generally assigned to end sites in fixed amounts |
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The actual usage of addresses within each assignment will be |
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(/48). The actual usage of addresses within each assignment will be |
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quite low, when compared to IPv4 assignments. In IPv6, “utilization” |
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quite low, when compared to IPv4 assignments. In IPv6, “utilization” |
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is only measured in terms of the bits to the left of the /48 |
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is only measured in terms of the bits to the left of the /56 |
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boundary. In other words, utilization refers to the assignment of |
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boundary. In other words, utilization refers to the assignment of |
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/48s to end sites, and not the number of addresses assigned within |
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/56s to end sites, and not the number of addresses assigned within |
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individual /48s at those end sites. |
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individual /56s at those end sites. |
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Throughout this document, the term utilization refers to the |
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Throughout this document, the term utilization refers to the |
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allocation of /48s to end sites, and not the number of addresses |
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allocation of /56s to end sites, and not the number of addresses |
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assigned within individual /48s within those end sites. |
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assigned within individual /56s within those end sites. |
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2.8. HD-Ratio |
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2.8. HD-Ratio |
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The HD-Ratio is a way of measuring the efficiency of address |
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The HD-Ratio is a way of measuring the efficiency of address |
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assignment [RFC 3194]. It is an adaptation of the H-Ratio originally |
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assignment [RFC 3194]. It is an adaptation of the H-Ratio originally |
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defined in [RFC1715] and is expressed as follows: |
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defined in [RFC1715] and is expressed as follows: |
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Log (number of allocated objects) |
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Log (number of allocated objects) |
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HD = ———————————————— |
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HD = ———————————————— |
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Log (maximum number of allocatable objects) |
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Log (maximum number of allocatable objects) |
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where (in the case of this document) the objects are IPv6 site |
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where (in the case of this document) the objects are IPv6 site |
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addresses (/48s) assigned from an IPv6 prefix of a given size. |
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addresses (/56s) assigned from an IPv6 prefix of a given size. |
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2.9. End site |
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2.9. End site |
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An end site is defined as an end user (subscriber) who has a business |
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An end site is defined as an end user (subscriber) who has a business |
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relationship with a service provider that involves: |
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relationship with a service provider that involves: |
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– that service provider assigning address space to the end user |
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– that service provider assigning address space to the end user |
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– that service provider providing transit service for the end user |
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– that service provider providing transit service for the end user |
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to other sites |
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to other sites |
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– that service provider carrying the end user’s traffic. |
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– that service provider carrying the end user’s traffic. |
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5.1. Initial allocation |
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5.1. Initial allocation |
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5.1.1. Initial allocation criteria |
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5.1.1. Initial allocation criteria |
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To qualify for an initial allocation of IPv6 address space, an |
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To qualify for an initial allocation of IPv6 address space, an |
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organization must: |
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organization must: |
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a) be an LIR; |
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a) be an LIR; |
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b) not be an end site; |
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b) not be an end site; |
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c) plan to provide IPv6 connectivity to organizations to which it |
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c) plan to provide IPv6 connectivity to organizations to which it |
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will assign /48s, by advertising that connectivity through its |
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will make assignments, by advertising that connectivity through |
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single aggregated address allocation; and |
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its single aggregated address allocation; and |
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d) have a plan for making at least 200 /48 assignments to other |
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d) have a plan for making at least 200 assignments to other |
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organizations within two years. |
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organizations within two years. |
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Private networks (those not connected to the public Internet) may |
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Private networks (those not connected to the public Internet) may |
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also be eligible for an IPv6 address space allocation provided they |
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also be eligible for an IPv6 address space allocation provided they |
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meet equivalent criteria to those listed above. |
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meet equivalent criteria to those listed above. |
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5.1.2. Minimum initial allocation size |
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5.1.2. Minimum initial allocation size |
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Organizations that meet the initial allocation criteria are eligible |
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Organizations that meet the initial allocation criteria are eligible |
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to receive a minimum allocation of /32. |
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to receive a minimum allocation of /32. |
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5.2. Subsequent allocation |
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5.2. Subsequent allocation |
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Organizations that hold an existing IPv6 allocation may receive a |
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Organizations that hold an existing IPv6 allocation may receive a |
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subsequent allocation in accordance with the following policies. |
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subsequent allocation in accordance with the following policies. |
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5.2.1. Subsequent allocation criteria |
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5.2.1. Subsequent allocation criteria |
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Subsequent allocation will be provided when an organization (ISP/LIR) |
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Subsequent allocation will be provided when an organization (ISP/LIR) |
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satisfies the evaluation threshold of past address utilization in |
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satisfies the evaluation threshold of past address utilization in |
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terms of the number of sites in units of /48 assignments. The HD- |
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terms of the number of sites in units of /56 assignments. The HD- |
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Ratio [RFC 3194] is used to determine the utilization thresholds that |
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Ratio [RFC 3194] is used to determine the utilization thresholds that |
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justify the allocation of additional address as described below. |
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justify the allocation of additional address as described below. |
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5.2.2. Applied HD-Ratio |
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5.2.2. Applied HD-Ratio |
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The HD-Ratio value of 0.8 is adopted as indicating an acceptable |
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The HD-Ratio value of 0.94 is adopted as indicating an acceptable |
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address utilization for justifying the allocation of additional |
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address utilization for justifying the allocation of additional |
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address space. Appendix A provides a table showing the number of |
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address space. Appendix A provides a table showing the number of |
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assignments that are necessary to achieve an acceptable utilization |
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assignments that are necessary to achieve an acceptable utilization |
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value for a given address block size. |
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value for a given address block size. |
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5.2.3. Subsequent Allocation Size |
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5.2.3. Subsequent Allocation Size |
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When an organization has achieved an acceptable utilization for its |
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When an organization has achieved an acceptable utilization for its |
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allocated address space, it is immediately eligible to obtain an |
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allocated address space, it is immediately eligible to obtain an |
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additional allocation that results in a doubling of the address space |
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additional allocation that results in a doubling of the address space |
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properly evaluate the HD-Ratio when a subsequent allocation becomes |
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properly evaluate the HD-Ratio when a subsequent allocation becomes |
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necessary. |
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necessary. |
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5.4. Assignment |
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5.4. Assignment |
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LIRs must make IPv6 assignments in accordance with the following |
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LIRs must make IPv6 assignments in accordance with the following |
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provisions. |
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provisions. |
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5.4.1. Assignment address space size |
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5.4.1. Assignment address space size |
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Assignments are to be made in accordance with the existing guidelines |
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End-users are assigned an end site assignment from their LIR or ISP. |
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[RFC3177,RIRs-on-48], which are summarized here as: |
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The exact size of the assignment is a local decision for the LIR or |
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ISP to make, using a minimum value of a /64 (when only one subnet is |
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– /48 in the general case, except for very large subscribers |
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anticipated for the end site) up to the normal maximum of /48, |
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– /64 when it is known that one and only one subnet is needed by |
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except in cases of extra large end sites where a larger assignment |
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design |
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can be justified. |
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– /128 when it is absolutely known that one and only one device is |
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connecting. |
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RIRs/NIRs are not concerned about which address size an LIR/ISP |
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RIRs/NIRs are not concerned about which address size an LIR/ISP |
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actually assigns. Accordingly, RIRs/NIRs will not request the |
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actually assigns. Accordingly, RIRs/NIRs will not request the |
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detailed information on IPv6 user networks as they did in IPv4, |
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detailed information on IPv6 user networks as they did in IPv4, |
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except for the cases described in Section 4.4 and for the purposes of |
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except for the cases described in Section 4.4 and for the purposes of |
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measuring utilization as defined in this document. |
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measuring utilization as defined in this document. |
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5.4.2. Assignment of multiple /48s to a single end site |
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5.4.2. Assignment of multiple /48s to a single end site |
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When a single end site requires an additional /48 address block, it |
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When a single end site requires an additional /48 address block, it |
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is regarded as one assignment regardless of the number of users using |
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is regarded as one assignment regardless of the number of users using |
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the PoP. A separate assignment can be obtained for the in-house |
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the PoP. A separate assignment can be obtained for the in-house |
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operations of the operator. |
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operations of the operator. |
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5.5. Registration |
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5.5. Registration |
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When an organization holding an IPv6 address allocation makes IPv6 |
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When an organization holding an IPv6 address allocation makes IPv6 |
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address assignments, it must register assignment information in a |
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address assignments, it must register assignment information in a |
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database, accessible by RIRs as appropriate (information registered |
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database, accessible by RIRs as appropriate (information registered |
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by an RIR/NIR may be replaced by a distributed database for |
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by an RIR/NIR may be replaced by a distributed database for |
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registering address management information in future). Information |
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registering address management information in future). Information |
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is registered in units of assigned /48 networks. When more than a |
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is registered in units of assigned /48 networks. When more than a |
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/48 is assigned to an organization, the assigning organization is |
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/48 is assigned to an organization, the assigning organization is |
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responsible for ensuring that the address space is registered in an |
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responsible for ensuring that the address space is registered in an |
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RIR/NIR database. |
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RIR/NIR database. |
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RIR/NIRs will use registered data to calculate the HD-Ratio at the |
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RIR/NIRs will use registered data to calculate the HD-Ratio at the |
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time of application for subsequent allocation and to check for |
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time of application for subsequent allocation and to check for |
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changes in assignments over time. |
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changes in assignments over time. |
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IRs shall maintain systems and practices that protect the security of |
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IRs shall maintain systems and practices that protect the security of |
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personal and commercial information that is used in request |
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personal and commercial information that is used in request |
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Organizations that received /35 IPv6 allocations under the previous |
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Organizations that received /35 IPv6 allocations under the previous |
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IPv6 address policy [RIRv6-Policies] are immediately entitled to have |
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IPv6 address policy [RIRv6-Policies] are immediately entitled to have |
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their allocation expanded to a /32 address block, without providing |
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their allocation expanded to a /32 address block, without providing |
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justification, so long as they satisfy the criteria in Section 5.1.1. |
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justification, so long as they satisfy the criteria in Section 5.1.1. |
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The /32 address block will contain the already allocated smaller |
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The /32 address block will contain the already allocated smaller |
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address block (one or multiple /35 address blocks in many cases) that |
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address block (one or multiple /35 address blocks in many cases) that |
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was already reserved by the RIR for a subsequent allocation to the |
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was already reserved by the RIR for a subsequent allocation to the |
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organization. Requests for additional space beyond the minimum /32 |
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organization. Requests for additional space beyond the minimum /32 |
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size will be evaluated as discussed elsewhere in the document. |
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size will be evaluated as discussed elsewhere in the document. |
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5.8. Assignments to IXPs and critical infrastructure |
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5.8. Portable assignments |
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5.8.1 Internet Exchange Points |
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5.8.1. Small multihoming assignments |
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An organization is eligible to receive a portable assignment from |
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APNIC if it is currently multihomed or plans to be multihomed |
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within three months. |
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An organization is considered to be multihomed if its network receives |
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full-time connectivity from more than one ISP and has one or more |
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routing prefixes announced by at least two of its ISPs. |
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The minimum assignment made under these terms is /48. |
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Address space assigned under these terms that is not used for |
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multihoming within three months of assignment by APNIC will be |
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reclaimed. |
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5.8.2. Internet Exchange Points |
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Internet Exchange Points are eligible to receive a portable assignment |
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Internet Exchange Points are eligible to receive a portable assignment |
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from APNIC to be used exclusively to connect the IXP participant devices |
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from APNIC to be used exclusively to connect the IXP participant devices |
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to the Exchange Point. |
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to the Exchange Point. |
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The minimum assignment made under these terms is /48. |
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The minimum assignment made under these terms is /48. |
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Global routability of the portable assignment is left to the discretion |
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Global routability of the portable assignment is left to the discretion |
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of the IXP and its participants. |
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of the IXP and its participants. |
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5.8.2 Critical infrastructure |
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5.8.3. Critical infrastructure |
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The following critical infrastructure networks, if operating in the Asia |
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The following critical infrastructure networks, if operating in the Asia |
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Pacific region, are eligible to receive a portable assignment: |
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Pacific region, are eligible to receive a portable assignment: |
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– root domain name system (DNS) server; |
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– root domain name system (DNS) server; |
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– global top level domain (gTLD) nameservers; |
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– global top level domain (gTLD) nameservers; |
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– country code TLD (ccTLDs) nameservers; |
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– country code TLD (ccTLDs) nameservers; |
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– IANA; |
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– IANA; |
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– Regional Internet Registry (RIRs); and |
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– Regional Internet Registry (RIRs); and |
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– National Internet Registry (NIRs). |
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– National Internet Registry (NIRs). |
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Assignments to critical infrastructure are available only to the actual |
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Assignments to critical infrastructure are available only to the actual |
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operators of the network infrastructure performing such functions. Registrar |
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operators of the network infrastructure performing such functions. Registrar |
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organisations which do not actually host the network housing the registry |
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organisations which do not actually host the network housing the registry |
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infrastructure, will not be eligible for an assignment under this policy. |
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infrastructure, will not be eligible for an assignment under this policy. |
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The maximum assignment made under these terms is /32 per operator. |
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The maximum assignment made under these terms is /32 per operator. |
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Exchanges made under this policy remain subject to the address space license |
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Exchanges made under this policy remain subject to the address space license |
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policy. |
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policy. |
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skipping to change at line 665 |
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skipping to change at line 674 |
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The HD-Ratio is not intended to replace the traditional utilization |
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The HD-Ratio is not intended to replace the traditional utilization |
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measurement that ISPs perform with IPv4 today. Indeed, the HD-Ratio |
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measurement that ISPs perform with IPv4 today. Indeed, the HD-Ratio |
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still requires counting the number of assigned objects. The primary |
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still requires counting the number of assigned objects. The primary |
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value of the HD-Ratio is its usefulness at determining reasonable |
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value of the HD-Ratio is its usefulness at determining reasonable |
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target utilization threshold values for an address space of a given |
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target utilization threshold values for an address space of a given |
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size. This document uses the HD-Ratio to determine the thresholds at |
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size. This document uses the HD-Ratio to determine the thresholds at |
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which a given allocation has achieved an acceptable level of |
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which a given allocation has achieved an acceptable level of |
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utilization and the assignment of additional address space becomes |
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utilization and the assignment of additional address space becomes |
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justified. |
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justified. |
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The utilization threshold T, expressed as a number of individual /48 |
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The utilization threshold T, expressed as a number of individual /56 |
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prefixes to be allocated from IPv6 prefix P, can be calculated as: |
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prefixes to be allocated from IPv6 prefix P, can be calculated as: |
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((48-P)*HD) |
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((56-P)*HD) |
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T = 2 |
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T = 2 |
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Thus, the utilization threshold for an organization requesting |
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Thus, the utilization threshold for an organization requesting |
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subsequent allocation of IPv6 address block is specified as a |
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subsequent allocation of IPv6 address block is specified as a |
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function of the prefix size and target HD ratio. This utilization |
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function of the prefix size and target HD ratio. This utilization |
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refers to the allocation of /48s to end sites, and not the |
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refers to the allocation of /56s to end sites, and not the |
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utilization of those /48s within those end sites. It is an address |
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utilization of those /56s within those end sites. It is an address |
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allocation utilization ratio and not an address assignment |
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allocation utilization ratio and not an address assignment |
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utilization ratio. |
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utilization ratio. |
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In accordance with the recommendations of [RFC 3194], this document |
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This document adopts an HD-Ratio of 0.94 as the utilization |
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adopts an HD-Ratio of 0.8 as the utilization threshold for IPv6 |
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threshold for IPv6 address space allocations. |
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address space allocations. |
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The following table provides equivalent absolute and percentage |
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The following table provides equivalent absolute and percentage |
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address utilization figures for IPv6 prefixes, corresponding to an |
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address utilization figures for IPv6 prefixes, corresponding to an |
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HD-Ratio of 0.8 |
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HD-Ratio of 0.94 |
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P 48-P Total /48s Threshold Util% |
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P 56-P Total /56s Threshold Util % |
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48 0 1 1 100.0% |
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56 0 1 1 100.0 |
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47 1 2 2 87.1% |
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55 1 2 2 95.9 |
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46 2 4 3 75.8% |
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54 2 4 4 92.0 |
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45 3 8 5 66.0% |
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53 3 8 7 88.3 |
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44 4 16 9 57.4% |
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52 4 16 14 84.7 |
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43 5 32 16 50.0% |
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51 5 32 26 81.2 |
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42 6 64 28 43.5% |
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50 6 64 50 77.9 |
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41 7 128 49 37.9% |
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49 7 128 96 74.7 |
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40 8 256 84 33.0% |
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48 8 256 184 71.7 |
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39 9 512 147 28.7% |
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47 9 512 352 68.8 |
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38 10 1024 256 25.0% |
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46 10 1,024 676 66.0 |
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37 11 2048 446 21.8% |
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45 11 2,048 1,296 63.3 |
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36 12 4096 776 18.9% |
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44 12 4,096 2,487 60.7 |
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35 13 8192 1351 16.5% |
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43 13 8,192 4,771 58.2 |
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34 14 16384 2353 14.4% |
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42 14 16,384 9,153 55.9 |
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33 15 32768 4096 12.5% |
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41 15 32,768 17,560 53.6 |
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32 16 65536 7132 10.9% |
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40 16 65,536 33,689 51.4 |
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31 17 131072 12417 9.5% |
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39 17 131,072 64,634 49.3 |
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30 18 262144 21619 8.2% |
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38 18 262,144 124,002 47.3 |
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29 19 524288 37641 7.2% |
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37 19 524,288 237,901 45.4 |
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28 20 1048576 65536 6.3% |
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36 20 1,048,576 456,419 43.5 |
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27 21 2097152 114105 5.4% |
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35 21 2,097,152 875,653 41.8 |
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26 22 4194304 198668 4.7% |
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34 22 4,194,304 1,679,965 40.1 |
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25 23 8388608 345901 4.1% |
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33 23 8,388,608 3,223,061 38.4 |
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24 24 16777216 602249 3.6% |
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32 24 16,777,216 6,183,533 36.9 |
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23 25 33554432 1048576 3.1% |
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31 25 33,554,432 11,863,283 35.4 |
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22 26 67108864 1825677 2.7% |
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30 26 67,108,864 22,760,044 33.9 |
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21 27 134217728 3178688 2.4% |
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29 27 134,217,728 43,665,787 32.5 |
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20 28 268435456 5534417 2.1% |
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28 28 268,435,456 83,774,045 31.2 |
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19 29 536870912 9635980 1.8% |
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27 29 536,870,912 160,722,871 29.9 |
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18 30 1073741824 16777216 1.6% |
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26 30 1,073,741,824 308,351,367 28.7 |
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17 31 2147483648 29210830 1.4% |
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25 31 2,147,483,648 591,580,804 27.5 |
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16 32 4294967296 50859008 1.2% |
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24 32 4,294,967,296 1,134,964,479 26.4 |
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15 33 8589934592 88550677 1.0% |
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23 33 8,589,934,592 2,177,461,403 25.3 |
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14 34 17179869184 154175683 0.9% |
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22 34 17,179,869,184 4,177,521,189 24.3 |
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13 35 34359738368 268435456 0.8% |
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21 35 34,359,738,368 8,014,692,369 23.3 |
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12 36 68719476736 467373275 0.7% |
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20 36 68,719,476,736 15,376,413,635 22.4 |
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11 37 137438953472 813744135 0.6% |
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19 37 137,438,953,472 29,500,083,768 21.5 |
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10 38 274877906944 1416810831 0.5% |
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18 38 274,877,906,944 56,596,743,751 20.6 |
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9 39 549755813888 2466810934 0.4% |
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17 39 549,755,813,888 108,582,451,102 19.8 |
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8 40 1099511627776 4294967296 0.4% |
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16 40 1,099,511,627,776 208,318,498,661 18.9 |
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7 41 2199023255552 7477972398 0.3% |
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15 41 2,199,023,255,552 399,664,922,315 18.2 |
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6 42 4398046511104 13019906166 0.3% |
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14 42 4,398,046,511,104 766,768,439,460 17.4 |
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5 43 8796093022208 22668973294 0.3% |
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13 43 8,796,093,022,208 1,471,066,903,609 16.7 |
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4 44 17592186044416 39468974941 0.2% |
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12 44 17,592,186,044,416 2,822,283,395,519 16.0 |
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11 45 35,184,372,088,832 5,414,630,391,777 15.4 |
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10 46 70,368,744,177,664 10,388,121,308,479 14.8 |
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9 47 140,737,488,355,328 19,929,904,076,845 14.2 |
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8 48 281,474,976,710,656 38,236,083,765,023 13.6 |
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7 49 562,949,953,421,312 73,357,006,438,603 13.0 |
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6 50 1,125,899,906,842,620 140,737,488,355,328 12.5 |
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5 51 2,251,799,813,685,250 270,008,845,646,446 12.0 |
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4 52 4,503,599,627,370,500 518,019,595,058,136 11.5 |
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8. Appendix B: Background information |
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8. Appendix B: Background information |
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8.1. Background |
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8.1. Background |
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The impetus for revising the 1999 Provisional IPv6 policy started |
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The impetus for revising the 1999 Provisional IPv6 policy started |
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with the APNIC meeting held in Taiwan in August 2001. Follow-on |
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with the APNIC meeting held in Taiwan in August 2001. Follow-on |
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discussions were held at the October, 2001 RIPE and ARIN meetings. |
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discussions were held at the October, 2001 RIPE and ARIN meetings. |
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During these meetings, the participants recognized an urgent need for |
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During these meetings, the participants recognized an urgent need for |
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more detailed, complete policies. One result of the meetings was the |
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more detailed, complete policies. One result of the meetings was the |
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skipping to change at line 782 |
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skipping to change at line 799 |
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allocation policies could also result in the adoption of practices |
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allocation policies could also result in the adoption of practices |
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that lead to premature exhaustion of the address space. |
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that lead to premature exhaustion of the address space. |
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It should be noted that the 128-bit address space is divided into |
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It should be noted that the 128-bit address space is divided into |
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three logical parts, with the usage of each component managed |
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three logical parts, with the usage of each component managed |
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differently. The rightmost 64 bits, the Interface Identifier |
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differently. The rightmost 64 bits, the Interface Identifier |
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[RFC2373], will often be a globally-unique IEEE identifier (e.g., mac |
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[RFC2373], will often be a globally-unique IEEE identifier (e.g., mac |
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address). Although an “inefficient” way to use the Interface |
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address). Although an “inefficient” way to use the Interface |
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Identifier field from the perspective of maximizing the number of |
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Identifier field from the perspective of maximizing the number of |
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addressable nodes, the numbering scheme was explicitly chosen to |
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addressable nodes, the numbering scheme was explicitly chosen to |
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simplify Stateless Address Autoconfiguration [RFC2462]. |
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simplify Stateless Address Autoconfiguration [RFC2462]. The middle |
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bits of an address indicate the subnet ID. |
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The middle 16 bits of an address indicate the subnet ID. Per [RFC |
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3177, RIRs-on-48s], this field will often be inefficiently utilized, |
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but the operational benefits of a consistent width subnet field were |
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deemed to be outweigh the drawbacks. |
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The decisions to inefficiently utilize the bits to the right of /48 |
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were made under the knowledge and assumption that the bits to the |
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left of /48 would be managed prudently and that if done so, will be |
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adequate for the expected lifetime of IPv6 [RFC3177]. |
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8.4. Acknowledgment |
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8.4. Acknowledgment |
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The initial version of this document was produced by The JPNIC IPv6 |
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The initial version of this document was produced by The JPNIC IPv6 |
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policy drafting team consisting of Akihiro Inomata, Akinori Maemura, |
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policy drafting team consisting of Akihiro Inomata, Akinori Maemura, |
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Kosuke Ito, Kuniaki Kondo, Takashi Arano, Tomohiro Fujisaki, and |
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Kosuke Ito, Kuniaki Kondo, Takashi Arano, Tomohiro Fujisaki, and |
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Toshiyuki Yamasaki. Special thanks goes out to this team, who worked |
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Toshiyuki Yamasaki. Special thanks goes out to this team, who worked |
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over a holiday in order to produce an initial document quickly. |
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over a holiday in order to produce an initial document quickly. |
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An editing team was then organized by representatives from each of |
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An editing team was then organized by representatives from each of |
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End of changes. 28 change blocks. |
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107 lines changed or deleted |
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115 lines changed or added |
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