Savvis Related Routing Issue

Sun Jul 20 02:36:17 UTC 2008

Hello, 

I am seeing a really weird routing issue. I have customers who are having trouble connecting to hosts on the internet. The common item seems to be Savvis. 

orange:~>traceroute mail.tecumsehherald.com 
traceroute to mail.tecumsehherald.com (64.14.74.42) 
1 204.16.245.97 (204.16.245.97) 0.580 ms 0.800 ms 1.020 ms 
2 204.16.241.225 (204.16.241.225) 0.496 ms 0.478 ms 0.699 ms 
3 64.209.102.233 (64.209.102.233) 7.177 ms 7.420 ms 7.417 ms 
4 te1-3-10g.ar2.DCA3.gblx.net (67.17.108.145) 7.630 ms 7.870 ms 8.105 ms 
5 * * * 
6 * * * 

Hop 5 is a Savvis router. 

Now if i go to Global Crossings looking glass and run a trace from their DC router to the same host, it makes it. 

1 64.214.14.161 (64.214.14.161) 0.457 ms 0.429 ms 
2 te7-1-10G.ar2.DCA3.gblx.net (67.17.109.34) 1.401 ms 1.658 ms 
3 savvis-1.ar2.DCA3.gblx.net (64.212.107.26) 1.567 ms 1.339 ms 
4 ber1-tenge-2-1.virginiaequinix.savvis.net (204.70.193.6) 1.586 ms 1.511 ms 
5 cr1-tengig0-7-2-0.washington.savvis.net (204.70.197.242) 2.367 ms 2.547 ms 
6 cr1-pos-0-0-0-0.boston.savvis.net (204.70.193.177) 15.163 ms 15.836 ms 
7 hr1-pos-1-0-0.Waltham2bo2.savvis.net (208.172.51.66) 11.702 ms 11.780 ms 
8 csr1-ve242.Waltham1bo1.savvis.net (64.14.70.19) 12.202 ms 11.728 ms 
9 64.14.67.130 (64.14.67.130) 11.570 ms 11.592 ms 
10 ns2.s426.sureserver.com (64.14.74.42) 11.811 ms 11.927 ms 

Now to top it all of, if i run a trace to the 64.14.74.41, instead of 64.14.74.42 it works... 

agg1.pit#traceroute 64.14.74.41 
Type Control-c to abort 
Tracing the route to IP node 64.14.74.41 from 1 to 30 hops 

1 <1 ms <1 ms <1 ms 204.16.241.225 
2 7 ms 7 ms 6 ms 64.209.102.233 
3 7 ms 6 ms 6 ms te1-3-10g.ar2.DCA3.gblx.net [67.17.108.145] 
4 6 ms 6 ms 6 ms savvis-1.ar2.DCA3.gblx.net [64.212.107.26] 
5 45 ms 6 ms 7 ms ber1-tenge-2-1.virginiaequinix.savvis.net [204.70.193.6] 
6 14 ms 14 ms 15 ms cr1-tengig0-7-2-0.washington.savvis.net [204.70.197.242] 
7 21 ms 22 ms 23 ms cr1-pos-0-0-0-0.boston.savvis.net [204.70.193.177] 
8 20 ms 19 ms 20 ms hr1-pos-1-0-0.Waltham2bo2.savvis.net [208.172.51.66] 
9 19 ms 20 ms 19 ms csr1-ve242.Waltham1bo1.savvis.net [64.14.70.19] 
10 20 ms 19 ms 19 ms 64.14.67.130 
11 20 ms 20 ms 20 ms s426.sureserver.com [64.14.74.41] 

Does anyone have and ideas? 

Thanks, 

Brendan 