BCP38 exceptions for RFC1918 space

Valdis.Kletnieks at vt.edu Valdis.Kletnieks at vt.edu
Sun Aug 15 11:57:18 CDT 2010


On Sun, 15 Aug 2010 18:46:49 +0200, Florian Weimer said:

> > And that connection that's trying to use PMTU got established across the
> > commodity internet, how, exactly? ;)
> 
> ICMP "fragmentation needed, but DF set" messages carry the a addresses
> of intermediate routers which generate them (potentially in response
> to MTU drops) as source addresses, not the IP addresses of the peers
> in a connection.

If any long-haul carriers are originating ICMP packets for other people's
consumption from 1918 addresses rather than addresses in their address space,
it's time to name-n-shame so the rest of us can vote with our feet and
checkbooks.  There's no excuse for that in this day and age.

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