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Re: preventing future situations like panix
From: Josh Karlin <karlinjf () cs unm edu>
Date: Mon, 23 Jan 2006 18:45:37 -0700


For those prefixes announced by ConEd within the last 3 days that it
no longer owns, correct, it would not of helped.  But saving some is
certainly better than none.  For the second statement things get a
little more subtle.  We have considered allowing the trusted
originator of a prefix to split the space among itself and those
downstream of it without considering that suspicious behavior.  This
allows ASs to protect themselves via such methods.

Thanks for your comments!

Josh



On 1/23/06, Thor Lancelot Simon <tls () netbsd org> wrote:
On Mon, Jan 23, 2006 at 12:47:38PM -0700, Josh Karlin wrote:

Suspicious routes are those that originate at an AS that has not
originated the prefix in the last few days and those that introduce
sub-prefixes.  Sub-prefixes are always considered suspicious (~1 day)
and traffic will be routed to the super-prefix for the suspicious
period.

So, if you consider the recent Cone-D hijacking incident, it seems to
me that:

1) Cone-D's announcement of _some_ of the prefixes they announced would
   have been considered "suspicious" -- but not all, since some of the
   prefixes in question were for former customers or peers who had only
   recently terminated their business arrangements with Cone-D.

2) Panix's first, obvious countermeasure aimed at restoring their
   connectivity -- announcing their own address space split in half --
   would *also* have been considered suspicious, since it gave two
   "sub-prefixes" of what Cone-D was hijacking.

Unless I misunderstand what you're proposing -- which is entirely possible,
in fact perhaps even likely -- it seems to me that it might well have done
at least as much harm as good.

Thor



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