nanog mailing list archives
Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ?
From: Joe Provo <nanog-post () rsuc gweep net>
Date: Thu, 20 Aug 2009 06:02:11 -0400
On Tue, Aug 18, 2009 at 09:37:22AM +0200, Ivan Pepelnjak wrote:
Anybody have a handy route-map that will deny anything with a as-path longer than say 15-20? ;-)http://wiki.nil.com/Filter_excessively_prepended_BGP_paths
It will still be a while before we see unbroken 4byte AS behavior (that whole 'fix the teardown on a anyone sneezing' problem). But like with stale bogon filters, I expect folks inclined to use this to drop it in and forget about it. So it would be wise to adjust the recommended filter to anticipate a 2byteAS view allowing multiple instances of AS-TRANS; there's likely a more elegant approach, but the quick step of explicitly allowing _(23465_)+ before you deny _([0-9]+)_\1_\1_\1_\1_ Cheers, Joe -- RSUC / GweepNet / Spunk / FnB / Usenix / SAGE
Current thread:
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ?, (continued)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Ricky Beam (Aug 17)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Paul Ferguson (Aug 17)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Marko Milivojevic (Aug 17)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Brett Watson (Aug 17)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Kevin Oberman (Aug 17)
- RE: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Dylan Ebner (Aug 18)
- RE: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Ivan Pepelnjak (Aug 18)
- RE: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Dylan Ebner (Aug 18)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Nathan Ward (Aug 20)
- Re: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ? Jared Mauch (Aug 17)