nanog mailing list archives
Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks?
From: Leo Bicknell <bicknell () ufp org>
Date: Wed, 30 Nov 2011 19:27:17 -0800
In a message written on Wed, Nov 30, 2011 at 07:19:51PM -0500, Ray Soucy wrote:
There is a lot of talk about "buggy" systems that are unable to handle prefixes longer than 64; but I've yet to encounter one. I imagine if
This has been one of the first thing I tested with new router gear for, well, a decade or more now of IPv6 testing. I too have never encountered such a box, even in the early days of IPv6. I think if any such boxes were made they were likely prototypes and never sold in quantity. There was a different, but related problem early on. Platforms with 32-bit TCAM that had to be retrofitted for IPv6 had to do multiple lookups. Two lookups got you 64 bits, and since 64 bits was the "longest subnet" they did dumb things past that bit boundary. This could result in less than line rate performance of IPv6 frames. I'm honestly having trouble remembering which platforms had this issue, perhaps someone remembers better than I do. However, I do think my lack of memory is in part because I haven't encountered one in a network anytime recently... In short, a total non-issue in terms of IPv6 deployment today. -- Leo Bicknell - bicknell () ufp org - CCIE 3440 PGP keys at http://www.ufp.org/~bicknell/
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Current thread:
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks?, (continued)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Ray Soucy (Nov 30)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Owen DeLong (Nov 30)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Jeff Wheeler (Nov 30)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Ray Soucy (Nov 30)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Mark Blackman (Nov 30)
- RE: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Nathan Eisenberg (Nov 30)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Bill Stewart (Nov 30)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Mark Blackman (Nov 30)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Ray Soucy (Nov 30)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Valdis . Kletnieks (Nov 30)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Leo Bicknell (Nov 30)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Jimmy Hess (Nov 30)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Jimmy Hess (Nov 30)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Leo Bicknell (Nov 30)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Owen DeLong (Nov 29)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Dmitry Cherkasov (Nov 29)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Brzozowski, John (Nov 30)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Ray Soucy (Nov 29)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Leo Bicknell (Nov 29)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Ray Soucy (Nov 29)
- Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks? Owen DeLong (Nov 29)