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Date: Tue, 13 Nov 2007 11:12:41 -0500 (EST) From: Sean Donelan <sean@donelan.com> To: Drew Weaver <drew.weaver@thenap.com> cc: "nanog@merit.edu" <nanog@merit.edu> In-Reply-To: <B7152C470C9BF3448ED33F16A75D81C14D0FDF0265@exchanga.thenap.com> Errors-To: owner-nanog@merit.edu On Tue, 13 Nov 2007, Drew Weaver wrote: > Is it to be expected to see rfc1918 src'd packets coming from transit carriers? Yes. Any ISP which uses RFC1918 on "internal" links may generate various ICMP error packets (e.g. traceroute/TTL expire, PMTU discovery/Fragmentation required, etc) from router interfaces which have RFC1918 addresses for transit traffic. Some people filter them anyway, and get "*"'s in traceroutes and PMTU weirdness. #include "old debate about using RFC1918 addresses on transit links" #include "other old debate about filtering stuff in backbones or edge"
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