[92576] in North American Network Operators' Group
Re: icmp rpf
daemon@ATHENA.MIT.EDU (Tony Rall)
Tue Sep 26 03:25:11 2006
In-Reply-To: <20060925170900.0D60A28467@noc.mainstreet.net>
To: nanog@merit.edu
From: Tony Rall <trall@almaden.ibm.com>
Date: Tue, 26 Sep 2006 00:17:27 -0700
Errors-To: owner-nanog@merit.edu
On Monday, 2006-09-25 at 10:09 MST, Mark Kent <mark@noc.mainstreet.net>
wrote:
> Mark Smith replied with two paragraphs, but it's not 100% clear to me
> that he got the reason why I asked. I asked because his initial
statement
> boiled down to "numbering on un-announced space breaks PMTUD"...
> but it doesn't, not by itself (which he later expanded).
>
> It only does so in the presence of filtering.
Which is exactly what one might expect to happen. At least it seems to me
that RFC 3704 (BCP 84, http://www.ietf.org/rfc/rfc3704.txt) applies.
When your traffic is sourced with dubious addresses, you should expect
much of it to disappear. And when this happens, you're hurting your
customers and your customers' customers (okay, sometimes it's "just" your
peer's customers - still a concern in my opinion).
--
Tony Rall
