[121715] in North American Network Operators' Group
Re: Using /126 for IPv6 router links
daemon@ATHENA.MIT.EDU (Ryan Harden)
Mon Jan 25 14:24:12 2010
Date: Mon, 25 Jan 2010 13:23:42 -0600
From: Ryan Harden <hardenrm@uiuc.edu>
To: nanog@nanog.org
In-Reply-To: <9e246b4d1001251102u2b6ca6b1le4b7f259ea2d505b@mail.gmail.com>
Reply-To: hardenrm@uiuc.edu
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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Our numbering plan is this:
1) Autoconfigured hosts possible? /64
2) Autoconfigured hosts not-possible, we control both sides? /126
3) Autoconfigured hosts not-possible, we DON'T control both sides? /64
4) Loopback? /128
Within our /48 we've carved it into (4) /50s.
* First, Infrastructure. This makes ACLs cake.
** Within this /50 are smaller allocations for /126s and /128s and /64s.
* Second, User Subnets (16k /64s available)
** All non-infrastructure subnets are assigned from this pool.
* Third, Reserved.
* Fourth, Reserved.
We believe this plan gives us the most flexibility in the future. We
made these choices based upon what works the best for us and our tools
and not to conserve addresses. Using a single /64 ACL to permit/deny
traffic to all ptp at the border was extremely attractive, etc.
- --
Ryan M. Harden, BS, KC9IHX Office: 217-265-5192
CITES - Network Engineering Cell: 217-689-1363
2130 Digital Computer Lab Fax: 217-244-7089
1304 W. Springfield email: hardenrm@illinois.edu
Urbana, IL 61801
University of Illinois at Urbana/Champaign - AS38
University of Illinois - ICCN - AS40387
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