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[AfriNIC-rpd] Call for Comments for IPv6 HD Ratio Change

Duncan Martin ceo at
Sat May 12 15:26:34 UTC 2007

Planning the pattern of prefix assignments is important not only for RIRs but also for LIRs.  For example, at the 2005 IPv6 Global Summit in Barcelona, a recommendation was made concerning assignments by LIRs to university campus networks.  It was recommended that /48 assignments should be made on /44 boundaries so as to provide adequately for subsequent contiguous assignments to meet future needs of the campuses.  Tertiary Education Network (TENET), which acts as a LIR for South African universities and research institutions, has adopted precisely such a reservation policy governing its assignments to participating institutions.


Setting the threshold HD ratio at 0.94, as has been proposed and was generally supported at the AfriNIC-6 meeting, would force TENET and other LIRs with similar reservation policies to abandon these policies long before they would qualify for further /32 allocations.  At best, a policy of assigning on /47 boundaries - i.e. reserving just one further contiguous /48 per assignee, might be sustainable.


To address this situation, I'd like to suggest consideration of a simple addition to the proposed policy, as follows.  "AfriNIC recognizes the importance of LIRs' developing assignment policies that promote efficient use of address space in the long term.  Consequently, when a LIR applies for an additional allocation, if the LIR has a stated reservation policy according to which it provides for contiguous further assignments to existing assignees, then in calculating the LIR's current HD ratio, prefixes that are reserved for existing assignees in terms of the policy may be taken into account as though they were already assigned."


Duncan Martin



From: rpd-bounces at on behalf of hisham
Sent: Tue 5/8/2007 12:18 AM
To: rpd at
Subject: [AfriNIC-rpd] Call for Comments for IPv6 HD Ratio Change

Dear Colleagues

The Change the IPv6 HD ratio from 0.8 to 0.94 Policy Proposal
( has reached consensus
during the AfriNIC-6 Public Policy Meeting.

As per the Policy Development Process, 15 days is hereby given for final comments and
amendments; i.e. until 23rd May 2007.

Best Regards

AfriNIC - The African Network Information Centre <> 

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