General question on rfc1918
sean at donelan.com
Tue Nov 13 16:12:41 UTC 2007
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
#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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