Re: Seeking UUNET/Level3 help re packet loss between Comcast Onvoy customers
This is resolved, though no one knows exactly why. If someone at Global Crossing has relevant logs of route flaps or somesuch, that might be interesting, but I can live with the mystery. Comcast advertises a specific route for the problem space, 71.63.128.0/17. Don't ask me why. Early yesterday morning, they flapped that route -- stopped advertising it, then started again. *Probably* shortly after that, and possibly as a consequence, our connectivity to the range of Comcast IP addresses typically assigned to residential customers in MN was restored. Our ISP, Onvoy, has three upstreams: Verizon, Global Crossing, and ATT. The route from 137.22/16 and 130.71/16 to Comcast typically took the path carleton-onvoy-global crossing-level3-att-comcast But the path from Comcast to us was simply comcast-att-onvoy-carleton For some time, Global Crossing was a mystery hop, because Onvoy was not terribly communicative, and Global Crossing was not showing up in traceroutes. Onvoy has let us know that this was could have been because the glbx/onvoy link was filtering ICMP due to DDoS attacks, but this seems wrong to me on a number of levels. Anyway, it's fixed. -- Rich Graves http://claimid.com/rcgraves Carleton.edu Sr UNIX and Security Admin CMC135: 507-646-7079 Cell: 952-292-6529
Seeking UUNET/Level3 help re packet loss between Comcast Onvoy customers
0 5006 7018 13367 13367 13367 13367 i * 76.113.224.0/19 137.192.32.173 0 5006 7018 13367 13367 13367 13367 i * 76.133.0.0/19137.192.32.173 0 5006 7018 13367 13367 13367 13367 i * 76.133.0.0/17137.192.32.173 0 5006 3549 3356 13367 13367 13367 13367 13367 13367 i * 76.133.32.0/19 137.192.32.173 0 5006 7018 13367 13367 13367 13367 i * 76.133.64.0/19 137.192.32.173 0 5006 7018 13367 13367 13367 13367 i * 76.133.96.0/19 137.192.32.173 0 5006 7018 13367 13367 13367 13367 i * 76.154.0.0/19137.192.32.173 0 5006 7018 13367 13367 13367 13367 i * 76.154.0.0/17137.192.32.173 0 5006 7018 13367 13367 13367 13367 i * 76.154.32.0/19 137.192.32.173 0 5006 7018 13367 13367 13367 13367 i * 76.154.64.0/19 137.192.32.173 0 5006 7018 13367 13367 13367 13367 13367 i * 76.154.96.0/19 137.192.32.173 0 5006 7018 13367 13367 13367 13367 13367 i * 209.162.0.0/18 137.192.32.173 0 5006 7018 13367 13367 13367 13367 i cisco7200#show ip bgp neighbors 192.42.152.218 routes | include 13367 * 24.31.0.0/19 192.42.152.218110 0 57 13367 i * 24.118.0.0/16192.42.152.218110 0 57 13367 i * 24.245.0.0/18192.42.152.218110 0 57 13367 i * 24.245.64.0/20 192.42.152.218110 0 57 13367 i * 66.41.0.0/16 192.42.152.218110 0 57 13367 i * 67.190.192.0/19 192.42.152.218110 0 57 13367 i * 67.190.224.0/19 192.42.152.218110 0 57 13367 i * 69.180.128.0/18 192.42.152.218110 0 57 13367 i * 70.89.196.0/22 192.42.152.218110 0 57 13367 i * 70.89.200.0/22 192.42.152.218110 0 57 13367 i * 71.193.64.0/19 192.42.152.218110 0 57 13367 i cisco7200#sho ip bgp 71.63.168.1 BGP routing table entry for 71.63.128.0/17, version 31179174 Paths: (1 available, best #1, table Default-IP-Routing-Table) Not advertised to any peer 5006 3549 3356 13367 13367 13367 13367 137.192.32.173 from 137.192.32.173 (172.30.0.5) Origin IGP, localpref 100, valid, external, best Community: 328073238 cisco7200#sho ip bgp 73.112.232.1 BGP routing table entry for 73.112.0.0/14, version 31179171 Paths: (1 available, best #1, table Default-IP-Routing-Table) Not advertised to any peer 5006 3549 3356 13367 13367 13367 13367 137.192.32.173 from 137.192.32.173 (172.30.0.5) Origin IGP, localpref 100, valid, external, best Community: 328073238 -- Rich Graves http://claimid.com/rcgraves Carleton.edu Sr UNIX and Security Admin CMC135: 507-646-7079 Cell: 952-292-6529
