[ipv6-wg] /127 for point to point links
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Pekka Savola
pekkas at netcore.fi
Fri Feb 12 11:35:54 CET 2010
On Fri, 12 Feb 2010, Vegard Svanberg wrote: > Hello. We've stumbled across a problem with a router manufacturer, which > won't implement support for /127 prefix lengths. Now, we do have > peering/transit partners using /127 on their p2p links. The result is > that we either cannot peer with them, or will have to get new routers. > > RFC 3627 states that /127 is considered harmful, however I do feel this > RFC confuse people since it doesn't propose a definite solution. It > suggests a number of solutions and indicates using /64 is the right > thing. I must say I strongly disagree on that conclusion. Wasting so > much address space on point to point links just makes no sense to me. The argument about wasting address space is not useful. However, there are other arguments for using /127, especially if you're using e.g. SDH technology (the interface is "point-to-point" media). http://tools.ietf.org/html/draft-kohno-ipv6-prefixlen-p2p-00 describes these to some degree. (The draft is being revised.) -- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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