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Re: Bad bad routing problems?

  • From: Mike Tancsa
  • Date: Sat Aug 31 12:16:38 2002


Strange, from my network I see you via GT and via Telus but not via AT&T

From me (as11647)
BGP routing table entry for 216.223.192.0/19
Paths: (2 available, best #2, table Default-IP-Routing-Table)
  Not advertised to any peer
  852 174 8001 4276
    209.115.141.1 from 209.115.141.1 (209.115.137.196)
      Origin IGP, localpref 100, valid, external
      Last update: Sat Aug 31 08:47:55 2002

  6539 8001 4276
    64.7.143.42 from 64.7.143.42 (64.7.143.42)
      Origin IGP, localpref 100, valid, internal, best
      Community: 6539:30
      Last update: Sat Aug 31 08:47:30 2002


From the AT&T CANADA routeserver  (route-server.east.attcanada.com)
AT&T route server
route-server.east>show ip bgp 216.223.192.0/19
% Network not in table
route-server.east>

AT&T Canada gets to 8001 via Williams, but I dont see your /19 through them.

route-server.east>show ip bgp regex _8001_
BGP table version is 2266132, local router ID is 216.191.65.118
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*>i12.129.128.0/24  216.191.64.253                 80      0 7911 8001 22420 i
*>i63.74.146.0/23   216.191.64.253                 80      0 7911 8001 23368 i


At 10:54 AM 8/31/2002 -0400, Gerald wrote:

We are seeing bad routing problems from outside our network. Can anyone
corroborate this or help?

We are on AS4276 and all traffic from us to our upstream seems good. Great
way to spend holiday weekend. /me wonders if anyone is even awake on the
NANOG list. :-)

2 addresses in our network I've tested with are:

216.223.200.14
and 216.223.192.68

Many many traces done, some interesting ones below:

Here is a succesful traceroute:
traceroute to 216.223.200.14 (216.223.200.14), 30 hops max, 40 byte
1 <10 ms <10 ms <10 ms rt1.altair7.com [209.11.155.129]
2 <10 ms 15 ms 16 ms 209.10.41.130
3 <10 ms 16 ms 15 ms ge-6-1-0.core1.sjc1.globix.net [209.10.2.193]
4 <10 ms 16 ms 16 ms so-4-2-0.core1.sjc4.globix.net [209.10.11.221]
5 63 ms 46 ms 47 ms so-1-0-0.core2.cgx2.globix.net [209.10.10.150]
6 62 ms 63 ms 47 ms so-0-0-0.core1.cgx2.globix.net [209.10.10.157]
7 78 ms 94 ms 94 ms so-1-0-0.core2.nyc8.globix.net [209.10.10.162]
8 78 ms 94 ms 94 ms pos15-0.core2.nyc1.globix.net [209.10.11.169]
9 78 ms 94 ms 94 ms s5-0-peer1.nyc3.globix.net [209.10.12.18]
10 78 ms 94 ms 94 ms nyiix.peer.nac.net [198.32.160.20]
11 78 ms 94 ms 93 ms internetchannel.customer.nac.net [209.123.10.34]
12 78 ms 94 ms 94 ms auth-2.inch.com [216.223.200.14]

> These show failures before reaching our network:
>
> traceroute to 216.223.192.68 (216.223.192.68): 1-30 hops, 38 byte packets
> 1 paleagw4.hpl.external.hp.com (192.6.19.2) 1.95 ms 1.95 ms 5.86 ms
> 2 palgwb01-vbblpa.americas.hp.net (15.243.170.49) 0.976 ms 0.977 ms
> 0.976 ms
> 3 svl-edge-15.inet.qwest.net (65.115.64.25) 0.976 ms !H * 0.977 ms !H
> 4 * * *
> 5 * * *
>
>
>
> traceroute to 216.223.192.68 (216.223.192.68), 30 hops max, 40 byte
> packets
> 1 e3-13.foundry1.cs.wisc.edu (198.133.224.116) 2.195 ms 1.754 ms
> 1.663 ms
> 2 e15.extreme1.cs.wisc.edu (128.105.1.1) 0.856 ms 0.765 ms 0.737 ms
> 3 144.92.128.194 (144.92.128.194) 1.550 ms 1.171 ms 1.264 ms
> 4 * * *
> 5 * * *
>
> All global crossing traces seem to loop within their router:
> traceroute to 216.223.192.68 (216.223.192.68), 30 hops max, 40 byte
> 1 64.214.13.1 (64.214.13.1) 0.695 ms 0.889 ms 0.485 ms 0.453 ms 0.350 ms
> 2 64.214.13.1 (64.214.13.1) 4.535 ms !N ms * ms 0.574 ms !N ms
> 3 * (64.214.13.1) 64.214.13.1 ms 0.408 ms !N ms * ms 0.425 ms
> 4 64.214.13.1 (64.214.13.1) 0.741 ms !N ms * ms 0.542 ms !N ms
>
> traceroute to 216.223.200.14 (216.223.200.14), 30 hops max, 40 byte
> 1 ROUTER6.VINEYARD.NET (204.17.195.236) 0.401 ms 0.342 ms 0.325 ms
> 2 bos-edge-01.inet.qwest.net (65.115.97.141) 7.249 ms 7.089 ms 6.943
> ms
> 3 * * *
> 4 * * bos-edge-01.inet.qwest.net (65.115.97.141) 9.885 ms !H
> 5 * * *
> 6 * * *
> 7 bos-edge-01.inet.qwest.net (65.115.97.141) 7.330 ms !H * *
> 8 * * *
> 9 * * *
> 10 * * *
> 11 * * *
> 12 * * *
> 13 * * *
> 14 * * *
> 15 * bos-edge-01.inet.qwest.net (65.115.97.141) 7.021 ms !H *
> 16 * bos-edge-01.inet.qwest.net (65.115.97.141) 172.856 ms !H *
> 17 * * *
> 18 * * *
> 19 * * bos-edge-01.inet.qwest.net (65.115.97.141) 7.127 ms !H
> 20 * * bos-edge-01.inet.qwest.net (65.115.97.141) 6.787 ms !H
> 21 * * bos-edge-01.inet.qwest.net (65.115.97.141) 61.972 ms !H
> 22 * bos-edge-01.inet.qwest.net (65.115.97.141) 22.525 ms !H *
> 23 * bos-edge-01.inet.qwest.net (65.115.97.141) 6.944 ms !H *
> 24 bos-edge-01.inet.qwest.net (65.115.97.141) 15.922 ms !H * *
> 25 bos-edge-01.inet.qwest.net (65.115.97.141) 11.212 ms !H * 6.895 ms
>
> This one works:
>
> traceroute to 216.223.192.68 (216.223.192.68), 30 hops max, 40 byte
> 1 tin-V8.cac.washington.edu (140.142.3.1) 1 ms 0 ms 1 ms
> 2 uwbr2-GE1-1.cac.washington.edu (140.142.155.24) 1 ms 1 ms 0 ms
> 3 cnsp2-wes-GE0-1-0.pnw-gigapop.net (198.107.151.5) 1 ms 1 ms 1 ms
> 4 ge-7-2-0.r04.sttlwa01.us.bb.verio.net (129.250.10.77) 0 ms 0 ms 1 ms
> 5 p4-1-0-0.r03.sttlwa01.us.bb.verio.net (129.250.2.230) 0 ms 1 ms 0 ms
> 6 p16-0-1-0.r20.sttlwa01.us.bb.verio.net (129.250.2.14) 1 ms 0 ms 1 ms
> 7 p16-0-1-2.r21.plalca01.us.bb.verio.net (129.250.5.83) 23 ms 23 ms 23 ms
> 8 p64-0-0-0.r20.plalca01.us.bb.verio.net (129.250.3.76) 22 ms 23 ms 22 ms
> 9 p16-1-1-1.r20.dllstx01.us.bb.verio.net (129.250.4.104) 57 ms 57 ms 57 ms
> 10 p64-0-0-0.r21.dllstx01.us.bb.verio.net (129.250.3.41) 57 ms 57 ms 57 ms
> 11 p16-2-0-0.r00.stngva01.us.bb.verio.net (129.250.5.35) 87 ms 87 ms 88 ms
> 12 p16-0-0-0.r02.stngva01.us.bb.verio.net (129.250.5.15) 87 ms 88 ms 87 ms
> 13 p16-7-0-0.r02.mclnva02.us.bb.verio.net (129.250.5.47) 88 ms 88 ms 88 ms
> 14 p4-3-0.r00.mclnva02.us.bb.verio.net (129.250.5.249) 88 ms 88 ms 88 ms
> 15 mae-east-atm.peer.nac.net (198.32.187.103) 89 ms 89 ms 90 ms
> 16 a9-0-1064.msfc1.nyc.nac.net (209.123.11.41) 95 ms 95 ms 96 ms
> 17 internetchannel.customer.nac.net (209.123.10.34) 96 ms 96 ms 96 ms
> 18 s0-varick-gw.inch.com (216.223.200.206) 100 ms 100 ms 100 ms
> 19 rubber-biscuit.inch.com (216.223.192.98) 99 ms 99 ms 99 ms
> 20 rubber-biscuit.inch.com (216.223.192.98) 99 ms !H 100 ms !H 98 ms !H
--------------------------------------------------------------------
Mike Tancsa,                          	          tel +1 519 651 3400
Sentex Communications,     			  mike@sentex.net
Providing Internet since 1994                    www.sentex.net
Cambridge, Ontario Canada			  www.sentex.net/mike





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