North American Network Operators Group

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Re: That pesky AS path corruption bug...

  • From: Jeff Haas
  • Date: Tue May 23 13:22:45 2000

On Tue, May 23, 2000 at 12:40:00PM -0400, Blaine Christian wrote:
> Since the corrupted AS-path does not include the AS that the route is
> coming from (at least in the corruption that I saw) it seems to me that a
> simple solution for all is to filter on AS i.e. only allow routes that
> have the AS of your EBGP neighbor prepended to them.

Just a note that this breaks route servers.  Caveat programmer.

And how do you mean "corrupted"?  If the packet is syntacically
invalid, its perfectly legal to send a NOTIFY and drop the 
session.  GateD did this to Proteon for years. :-)

> Blaine

Jeffrey Haas - Merit RSng project - [email protected]