Re: long as path games?

[Blaine Christian <blaine () blaines net>]

Specifically, they have the ability to tickle a legacy cisco bug with AS
path length.  This bug was supposedly mitigated in code and I believe my
previous company is still filtering AS path length (UUNET) of 100 or
greater. 

A valid AS-Path of greater than 100 has not yet been found (which was why
the filters were in place).





On 1/31/05 8:53 AM, "Jared Mauch" <jared () puck nether net> wrote:

> On Mon, Jan 31, 2005 at 07:19:14AM +0200, Hank Nussbacher wrote:
> > At 10:23 PM 30-01-05 -0500, Jon Lewis wrote:
> >
> > > Someone at fido.net having some bgp config issues?
> >
> > Looks like someone probing for a buffer overflow on a world-wide basis.
> >
> > -Hank
> >
> >
> > > Jan 30 18:34:51 EST: %BGP-6-ASPATH: Long AS path 6461 3356 6770 8282 8282
> > > 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282
> > > 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282
> > > 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282
> > > 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282
> > > 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282
> > > 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282 8282
> > > received from ...
>
> Router(config-router)#bgp maxas-limit ?
>   <1-2000>  Number of ASes in the AS-PATH attribute
>
> Router(config-router)#bgp maxas-limit 50
>
> Easy to fix/reject.
>
> - jared