---------------------------------------------------------------------------------------------------------- prop-141-v003: Change maximum delegation size of IPv4 address from 512 ( /23 ) to 768 (/23+/24) addresses. ----------------------------------------------------------------------------------------------------------- Proposer: Simon Sohel Baroi (sbaroi@gmail.com) Aftab Siddiqui (aftab.siddiqui@gmail.com) 1. Problem statement -------------------- According to the APNIC IPv4 Address Report,(https://www.apnic.net/manage-ip/ipv4-exhaustion/ ) the available and reserve pool size is as follows: Available Pool : IP Address 3,782,144 | 14,774 Of /24 Reserved Pool : IP Address 1,831,680 | 7,155 Of /24 If APNIC continues to delegate IPv4 in size of /23 with the average growth rate of 145 x /23 delegations per month the pool will be exhausted around Aug/Sep 2027. Which means the huge number of IPv4 addresses will be unused for a long time and large community members will still remain behind the NAT box or even without Internet Connectivity. 2. Objective of policy change ----------------------------- The current final /8 allocation policy [1] advise that the current minimum delegation size for IPv4 is 256 (/24) addresses and each APNIC account holder is only eligible to receive IPv4 address delegations totaling a maximum 512 (/23) addresses from the APNIC 103/8 IPv4 address pool. (6.1. Minimum and maximum IPv4 delegations) This is a proposal to change the maximum size of IPv4 address delegations from the available IPv4 address pool to a totaling of 768 (/23+/24) addresses. This proposal also indicates how APNIC will distribute the IPv4 resources systematically when the available pool size reduces. Increasing the maximum IPv4 delegation size from 512 ( /23 ) to 768 (/23+/24) address pool will allow Newcomers and also Existing APNIC account holders to get maximum number of IPv4 address resources. 3. Situation in other regions ----------------------------- There is no similar policy in place in other RIR regions. 4. Proposed policy solution --------------------------- It is recommended to increase the IPv4 address delegation size from 512 max (/23) to 768 (/23 + /24). The address space can now be allocated from the available 103/8 last /8 block and/or from non 103/8 recovered address blocks. This policy will continue until the available + reserved pool comes down to 900,096 IPv4 addresses i.e. < 3516x/24, once reaching this threshold the maximum delegation size will revert back to 512 IPv4 addresses (/23) and will continue to do so until the available + reserved pool comes down to 256,000 IPv4 addresses i.e 1000x/24 then the delegation size will further reduce to 256 IPv4 addresses i.e. /24. The very first time the reserved and available pool goes below 190,000 IPv4 addresses, then the IPv4 reserved pool (APNIC-127 Section 5.1.1) for Future Use of /16 (i.e. 256 x /24s) will be added to the available pool. It is proposed to modify the section 6.1 maximum IPv4 delegations of the APNIC Internet Number Resource Policies [1] accordingly. Current Policy text : Since Thursday, 28 February 2019, each APNIC account holder is only eligible to receive IPv4 address delegations totalling a maximum /23 from the APNIC 103/8 IPv4 address pool. New Policy text : New APNIC Member is only eligible to receive IPv4 address delegations totalling a maximum 768 (/23+/24) from the APNIC available IPv4 address pool. Existing APNIC account holders who only has less IPv4 resources can apply for maximum delegation respectively maintaining the criteria matched with section 7.0. If the available IPv4 Pool size, which consists of available and reserve pool, reaches 900,096 addresses (3516, /24s after last delegation), the delegation size will automatically become 512 (/23) IPv4 addresses. If the available IPv4 Pool size, which consists of available and reserve pool, reaches 256,000 IPv4 addresses (i.e. 1000 /24s after last delegation), the delegation size will be reduced to 256 (/24) IPv4 addresses. The very first time the reserved and available pool goes below 190,000 IPv4 addresses then, the IPv4 reserved pool of /16 (256 /24s) will be added to the available pool (APNIC-127 Section 5.1.1). At any point, if APNIC receives a large block of recovered/returned/etc IPv4 address space increasing the total available address space and moved into the previous threshold then, the delegation size will revert back to previous delegation size as well. Also, all delegations at this stage have to be made retrospectively i.e. any member who received smaller delegation size will be eligible to receive more IPv4 addresses as per this policy, based on their usage criteria matched with section 7.0 and availability of addresses. Whenever the next threshold is met then all resource requests received on the day and all those under review should be dealt with by the previous threshold. Threshold Stages for IPv4 addresses (Available + Reserved): Stage 1 - More than 900,000 IPv4 addresses: Delegation Size /23 + /24 Stage 2 - Less than 900,000 IPv4 addresses and more than or equal to 256,000 IPv4 addresses: Delegation Size /23 Stage 3 - Less than 256,000 IPv4 addresses and more than 190,000 : Delegation Size /24 Stage 4 - Less than 190,000 IPv4 addresses add APNIC-127 5.1.1 Reserved /16 to available pool: Delegation Size /24 5. Advantages / Disadvantages ----------------------------- Advantages: This proposal will ensure smooth allocation of IPv4 addresses to existing and new APNIC members. Disadvantages: This might add up to 10,000 /24s into the global routing table i.e. 1.2% increase. The current growth rate without this policy is approximately 7% every year. 6. Impact on resource holders ----------------------------- The Organization who already became an APNIC member and has less IPv4 Resources can also apply for maximum delegation. 7. References ------------- [1] Section 6.1. "Minimum and maximum IPv4 delegations" of "Policies for IPv4 address space management in the Asia Pacific region" https://www.apnic.net/community/policy/resources#6.1.-Minimum-and-maximum-IPv4-delegations