[105751] in North American Network Operators' Group
Re: IPv4 source routing options and IPv6 Type 0 Routing Header
daemon@ATHENA.MIT.EDU (John Osmon)
Mon Jun 30 15:10:57 2008
Date: Mon, 30 Jun 2008 13:10:46 -0600
From: John Osmon <josmon@rigozsaurus.com>
To: Sam Stickland <sam_mailinglists@spacething.org>
Mail-Followup-To: John Osmon <josmon@rigozsaurus.com>,
Sam Stickland <sam_mailinglists@spacething.org>, nanog@merit.edu
In-Reply-To: <48691950.1060009@spacething.org>
Cc: nanog@merit.edu
Errors-To: nanog-bounces@nanog.org
On Mon, Jun 30, 2008 at 06:35:12PM +0100, Sam Stickland wrote:
> Can someone give an example of how to use source routing to check a
> peers routing policy?
Channelling from a similar private conversation I had many years ago:
Seeing if packets directed to prefixes that you're not announcing come
back to you is interesting (and can be an indicator that someone is
pointing default at you). Seeing if packets directed to prefixes you
*are* announcing *do* come back to you is also interesting.
So, an example might be to send a traceroute across a peer's link
via source routing, and watching the result.
