[128743] in North American Network Operators' Group
Re: BCP38 exceptions for RFC1918 space
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Sun Aug 15 12:57:28 2010
To: Florian Weimer <fw@deneb.enyo.de>
In-Reply-To: Your message of "Sun, 15 Aug 2010 18:46:49 +0200."
<87iq3bg6x2.fsf@mid.deneb.enyo.de>
From: Valdis.Kletnieks@vt.edu
Date: Sun, 15 Aug 2010 12:57:18 -0400
Cc: nanog@merit.edu
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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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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