[128781] in North American Network Operators' Group
Re: BCP38 exceptions for RFC1918 space
daemon@ATHENA.MIT.EDU (David Freedman)
Mon Aug 16 06:43:01 2010
To: nanog@nanog.org
From: David Freedman <david.freedman@uk.clara.net>
Date: Mon, 16 Aug 2010 11:42:41 +0100
X-Complaints-To: usenet@dough.gmane.org
In-Reply-To: <87vd7bg8em.fsf@mid.deneb.enyo.de>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Florian Weimer wrote:
> What's the current consensus on exempting private network space from
> source address validation? Is it recommended? Discouraged?
>
> (One argument in favor of exceptions is that it makes PMTUD work if
> transfer networks use private address space.)
>
>
IMHO, operators who number infrastructure out of RFC1918 and then permit
internet traceroutes over it are misguided and should consider avoiding
TTL decrement (i.e using mpls without internet TTL propagation) as a
less stressful (for us) alternative to simply filtering.
Dave.
--
David Freedman
Group Network Engineering
Claranet Group
