North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: long as path games?
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" <[email protected]> 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
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