From: Bill Fink <bill@wizard.nasa.atd.net>
Subject: Re: traceroute
To: Litvanyi@Colorado.EDU
Date: Mon, 23 Nov 1998 20:21:38 -0500 (EST)
Cc: hammond@solarz.Colorado.EDU, dguevara@mail.arc.nasa.gov,
kjones@mail.arc.nasa.gov, mafoster@mail.arc.nasa.gov,
vishy@ciocc.arc.nasa.gov, bill@wizard.nasa.atd.net (Bill Fink)
X-Mailer: ELM [version 2.4 PL24]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Content-Length: 11615
>From the traceroute from jsimpson-h to hydra-atm1.Colorado.EDU, which
I am re-including below, the two primary hypothesis that I have formed
as to why the path from the Chicago NGIX to Colorado is not directly
across VBNS, but instead goes across Qwest, are as follows:
1. Colorado is no longer advertising the 198.11.22 net
to VBNS, or
2. The router 204.147.128.197, which I assume is a VBNS
router, and which is where the path diverges from
its previous direct path across VBNS, has a policy
to prefer Qwest routes over VBNS routes (or maybe
it has a new default route).
That's my best guess anyway at this point.
-Thanks
-Bill
P.S. I am also including an earlier traceroute that used the previous
direct path across VBNS for comparison purposes.
jsimpson% ping 198.11.22.12
PING 198.11.22.12 (198.11.22.12): 56 data bytes
64 bytes from 198.11.22.12: icmp_seq=0 ttl=248 time=209.818 ms
64 bytes from 198.11.22.12: icmp_seq=1 ttl=248 time=120.965 ms
64 bytes from 198.11.22.12: icmp_seq=2 ttl=248 time=116.213 ms
64 bytes from 198.11.22.12: icmp_seq=3 ttl=248 time=115.22 ms
64 bytes from 198.11.22.12: icmp_seq=4 ttl=248 time=125.994 ms
^C
--- 198.11.22.12 ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
jsimpson% traceroute 198.11.22.12
traceroute to 198.11.22.12 (198.11.22.12), 30 hops max, 96 byte packets
1 169.154.161.1 (169.154.161.1) 4.633 ms 6.306 ms 8.776 ms (6.0/6.000)
2 rtr-atm-a.gsfc.nasa.gov (169.154.1.1) 9.693 ms 7.587 ms 14.174 ms (9.0/10.000)
3 rtr-nren-gsfc-a.nasa.atd.net (198.119.5.250) 11.649 ms 6.228 ms 9.317 ms (9.0/8.667)
4 nren-chi-rtr.nren.nasa.gov (198.10.64.66) 22.248 ms 23.813 ms 23.025 ms (23.0/22.667)
5 204.147.128.197 (204.147.128.197) 28.026 ms 21.192 ms 25.965 ms (25.0/24.667)
6 cs-atm0-0-12.pym.vbns.net (204.147.130.102) 39.272 ms 38.795 ms 37.277 ms (38.0/38.000)
7 cs-hssi0-0.dc-nap.vbns.net (204.147.130.250) 41.122 ms 40.594 ms 43.027 ms (41.0/41.333)
8 mae-east-plusplus.washington.mci.net (192.41.177.181) 63.44 ms 64.625 ms 68.458 ms (64.0/65.000)
9 vienna2.va.us.eu.net (192.41.177.120) 98.04 ms 80.914 ms * (89.0/89.000)
10 New-York1.NY.US.EU.net (134.222.228.141) 78.678 ms 79.3 ms 84.571 ms (79.0/80.333)
11 * nyc-core-02.inet.qwest.net (205.171.17.9) 66.873 ms * (66.0/66.000)
12 nyc-core-01.inet.qwest.net (205.171.17.1) 71.253 ms * 75.925 ms (73.0/73.000)
13 * den-core-02.inet.qwest.net (205.171.4.5) 103.319 ms * (103.0/103.000)
14 den-edge-01.inet.qwest.net (205.171.16.94) 127.288 ms 124.914 ms * (125.5/125.500)
15 cnb7505.inet.qwest.net (205.169.250.33) 95.256 ms 129.22 ms 120.165 ms (120.0/114.667)
16 cuatm.inet.qwest.net (205.169.250.50) 101.517 ms 115.355 ms 123.75 ms (115.0/113.000)
17 hydra-atm1.Colorado.EDU (198.11.22.12) 115.869 ms 122.923 ms 104.294 ms (115.0/113.667)
Previous direct path across VBNS:
jsimpson% traceroute 198.11.22.12
traceroute to 198.11.22.12 (198.11.22.12), 30 hops max, 96 byte packets
1 169.154.161.1 (169.154.161.1) 4.129 ms 4.054 ms 4.875 ms (4.0/4.000)
2 rtr-atm-a.gsfc.nasa.gov (169.154.1.1) 6.059 ms 6.705 ms 5.848 ms (6.0/5.667)
3 rtr-nren-gsfc-a.nasa.atd.net (198.119.5.250) 4.529 ms 4.738 ms 8.095 ms (4.0/5.333)
4 nren-chi-rtr.nren.nasa.gov (198.10.64.66) 21.866 ms 19.707 ms 19.195 ms (19.0/19.667)
5 204.147.128.197 (204.147.128.197) 20.454 ms 20.676 ms 20.476 ms (20.0/20.000)
6 cs-atm0-0-12.dnj.vbns.net (204.147.129.186) 44.34 ms 44.494 ms 43.732 ms (44.0/43.667)
7 204.131.62.37 (204.131.62.37) 46.04 ms 45.736 ms 45.784 ms (45.0/45.333)
8 hydra-atm1.Colorado.EDU (198.11.22.12) 46.751 ms 46.564 ms 46.347 ms (46.0/46.000)
> I don't see that this has anything to do with abeliene, looks like
> standard commercial access to me. (EU net is owned by Qwest nowadays, so
> consider them one and the same). We are not hearing a route to
> 139.88.0.0/16 from the vBNS; just C&W via NCAR, and Qwest:
>
> cuatm-gw#sh ip bgp 139.88.0.0
> BGP routing table entry for 139.88.0.0/16, version 2513397
> Paths: (2 available, best #2, advertised over IBGP)
> 3909 209 286 3561 600 600
> 205.169.250.49 from 205.169.250.49 (205.169.250.45)
> Origin incomplete, metric 100, localpref 200, valid, external
> 194 3561 600 600
> 204.131.62.14 from 204.131.62.14 (128.117.243.65)
> Origin incomplete, metric 100, localpref 200, valid, external, best
>
> Are other sites able to reach you across the vBNS? We accept and prefer
> vBNS routes with few exceptions. (The few exceptions are NOAA/NIST and
> NCAR).
>
> Thanks,
> Caren
> :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> Caren Litvanyi, Network Engineering & Operations
> University of Colorado at Boulder
> 3645 Marine St. CB455
> Boulder, CO 80309
> voice:303-492-0841 fax:303-492-4198
> pager:<3 lines to litvanyi@itspager.colorado.edu
> :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
>
>
> On Mon, 23 Nov 1998, Anne Hammond wrote:
>
> > Date: Mon, 23 Nov 1998 15:06:49 -0700 (MST)
> > From: Anne Hammond <hammond@solarz.Colorado.EDU>
> > To: litvanyi@spot.colorado.edu
> > Cc: bill@wizard.nasa.atd.net, dguevara@mail.arc.nasa.gov,
> > hammond@solarz.Colorado.EDU, kjones@mail.arc.nasa.gov,
> > mafoster@mail.arc.nasa.gov, vishy@ciocc.arc.nasa.gov
> > Subject: traceroute
> >
> > Mon Nov 23 17:03:10 EST 1998
> >
> > commando.lerc.nasa.gov
> >
> >
> > [51] [commando] >traceroute hydra-atm.colorado.edu
> > traceroute to hydra-atm.colorado.edu (198.11.23.12), 30 hops max, 40 byte packets
> > 1 broatma3-0d.lerc.nasa.gov (139.88.154.1) 1 ms 1 ms 1 ms
> > 2 bro322.lerc.nasa.gov (139.88.3.4) 3 ms 3 ms 3 ms
> > 3 bro322c.lerc.nasa.gov (139.88.145.2) 6 ms 3 ms 5 ms
> > 4 oarnet-lerc.lerc.nasa.gov (192.168.128.2) 6 ms 5 ms 6 ms
> > 5 oeb1-sl12-0.columbus.oar.net (199.18.105.237) 23 ms 32 ms 33 ms
> > 6 oeb3-atm6-0.columbus.oar.net (199.18.202.13) 32 ms 23 ms 16 ms
> > 7 bordercore4-hssi0-0-0.Washington.cw.net (166.48.43.249) 57 ms 84 ms 44 ms
> > 8 core5.Washington.cw.net (204.70.4.109) 82 ms 194 ms 221 ms
> > 9 mae-east3-nap.Washington.cw.net (204.70.1.22) 138 ms 51 ms 113 ms
> > 10 vienna2.va.us.eu.net (192.41.177.120) 109 ms 68 ms *
> > 11 New-York1.NY.US.EU.net (134.222.228.141) 109 ms 121 ms 89 ms
> > 12 nyc-core-02.inet.qwest.net (205.171.17.9) 121 ms 119 ms *
> > 13 nyc-core-01.inet.qwest.net (205.171.17.1) 90 ms (ttl=244!) 73 ms (ttl=244!) *
> > 14 den-core-01.inet.qwest.net (205.171.4.5) 138 ms (ttl=243!) 126 ms (ttl=243!) 141 ms (ttl=243!)
> > 15 den-edge-01.inet.qwest.net (205.171.16.94) 123 ms (ttl=242!) 124 ms (ttl=242!) 114 ms (ttl=242!)
> > 16 * cnb7505.inet.qwest.net (205.169.250.33) 140 ms 122 ms
> > 17 cuatm.inet.qwest.net (205.169.250.50) 96 ms (ttl=245!) 116 ms (ttl=245!) 121 ms (ttl=245!)
> > 18 hydra-atm.Colorado.EDU (198.11.23.12) 95 ms (ttl=244!) 116 ms (ttl=244!) 100 ms (ttl=244!)
> >
> > [52] [commando] >traceroute hydra-atm1.colorado.edu
> > traceroute to hydra-atm1.colorado.edu (198.11.22.12), 30 hops max, 40 byte packets
> > 1 broatma3-0d.lerc.nasa.gov (139.88.154.1) 1 ms 1 ms 1 ms
> > 2 bro322.lerc.nasa.gov (139.88.3.4) 4 ms 3 ms 3 ms
> > 3 bro322c.lerc.nasa.gov (139.88.145.2) 24 ms 16 ms 46 ms
> > 4 oarnet-lerc.lerc.nasa.gov (192.168.128.2) 10 ms 5 ms 7 ms
> > 5 oeb1-sl12-0.columbus.oar.net (199.18.105.237) 25 ms 12 ms 13 ms
> > 6 oeb3-atm6-0.columbus.oar.net (199.18.202.13) 15 ms 13 ms 13 ms
> > 7 bordercore4-hssi0-0-0.Washington.cw.net (166.48.43.249) 26 ms 28 ms 32 ms
> > 8 core5.Washington.cw.net (204.70.4.109) 33 ms 25 ms 26 ms
> > 9 mae-east3-nap.Washington.cw.net (204.70.1.22) 32 ms 37 ms 32 ms
> > 10 vienna2.va.us.eu.net (192.41.177.120) 67 ms 47 ms 84 ms
> > 11 New-York1.NY.US.EU.net (134.222.228.141) 68 ms 94 ms 83 ms
> > 12 nyc-core-02.inet.qwest.net (205.171.17.9) 74 ms 108 ms 74 ms
> > 13 * nyc-core-01.inet.qwest.net (205.171.17.1) 51 ms (ttl=244!) 102 ms (ttl=244!)
> > 14 den-core-01.inet.qwest.net (205.171.4.5) 102 ms (ttl=243!) * *
> > 15 den-edge-01.inet.qwest.net (205.171.16.94) 140 ms (ttl=242!) 119 ms (ttl=242!) *
> > 16 * * cnb7505.inet.qwest.net (205.169.250.33) 136 ms
> > 17 cuatm.inet.qwest.net (205.169.250.50) 101 ms (ttl=245!) 110 ms (ttl=245!) 118 ms (ttl=245!)
> > 18 hydra-atm1.Colorado.EDU (198.11.22.12) 110 ms (ttl=244!) *
> > [53] [commando] >
> >
> >
> >
> >
> > hydra 27# traceroute commando.lerc.nasa.gov
> > traceroute to commando.lerc.nasa.gov (139.88.154.28), 30 hops max, 40 byte packets
> > 1 cuatm-gw-arp.Colorado.EDU (198.11.23.25) 1 ms 2 ms 1 ms
> > 2 ncaratm.inet.qwest.net (204.131.62.14) 2 ms 2 ms 2 ms
> > 3 border2-hssi1-0.Denver.cw.net (204.70.29.5) 99 ms (ttl=244!) 40 ms (ttl=244!) 30 ms (ttl=244!)
> > 4 core1-fddi-1.Denver.cw.net (204.70.3.113) 32 ms (ttl=245!) 38 ms (ttl=245!) 41 ms (ttl=245!)
> > 5 bordercore2.Atlanta.cw.net (166.48.48.1) 90 ms (ttl=245!) 82 ms (ttl=245!) 77 ms (ttl=245!)
> > 6 oarnet.Atlanta.cw.net (166.48.49.254) 82 ms (ttl=243!) 83 ms (ttl=243!) 85 ms (ttl=243!)
> > 7 oeb1-atm2-0.columbus.oar.net (199.18.202.11) 81 ms (ttl=243!) 83 ms (ttl=243!) 85 ms (ttl=243!)
> > 8 nasa-sl2-3.cleveland.oar.net (199.18.105.238) 98 ms (ttl=242!) 92 ms (ttl=242!) 154 ms (ttl=242!)
> > 9 192.168.128.1 (192.168.128.1) 122 ms (ttl=241!) * 107 ms (ttl=241!)
> > 10 * 192.168.128.1 (192.168.128.1) 92 ms (ttl=241!) *
> > 11 * 192.168.128.1 (192.168.128.1) 97 ms (ttl=241!) *
> > 12 192.168.128.1 (192.168.128.1) 95 ms (ttl=241!) * 103 ms (ttl=241!)
> > 13 * * *
> > 14 192.168.128.1 (192.168.128.1) 117 ms (ttl=241!) * 94 ms (ttl=241!)
> > 15 * 192.168.128.1 (192.168.128.1) 95 ms *
> > 16 * * *
> > 17 * 192.168.128.1 (192.168.128.1) 108 ms (ttl=241!) *
> > 18 192.168.128.1 (192.168.128.1) 108 ms (ttl=241!) * 110 ms (ttl=241!)
> > 19 * * 192.168.128.1 (192.168.128.1) 96 ms (ttl=241!)
> > 20 * * 192.168.128.1 (192.168.128.1) 139 ms (ttl=241!)
> > 21 * * 192.168.128.1 (192.168.128.1) 131 ms (ttl=241!)
> > 22 * *
> > 23 * 192.168.128.1 (192.168.128.1) 92 ms (ttl=241!) *
> > 24 192.168.128.1 (192.168.128.1) 93 ms (ttl=241!) * 92 ms (ttl=241!)
> > 25 * 192.168.128.1 (192.168.128.1) 92 ms (ttl=241!) *
> > 26 192.168.128.1 (192.168.128.1) 96 ms (ttl=241!) * 121 ms (ttl=241!)
> > 27 * 192.168.128.1 (192.168.128.1) 95 ms (ttl=241!) *
> > 28 192.168.128.1 (192.168.128.1) 93 ms (ttl=241!) * *
> > 29 192.168.128.1 (192.168.128.1) 92 ms (ttl=241!) * 103 ms (ttl=241!)
> > 30 * * *
> > hydra 28#
> >
> >
> >
> >
> > hydra 27# traceroute jsimpson-h.gsfc.nasa.gov
> > traceroute to jsimpson-h.gsfc.nasa.gov (169.154.161.43), 30 hops max, 40 byte packets
> > 1 198.11.22.25 (198.11.22.25) 1 ms 1 ms 1 ms
> > 2 * 204.131.62.38 (204.131.62.38) 92 ms (ttl=244!) 85 ms (ttl=244!)
> > 3 * cs-atm0-0-14.dng.vbns.net (204.147.129.185) 127 ms (ttl=244!) 91 ms (ttl=244!)
> > 4 204.147.128.198 (204.147.128.198) 67 ms (ttl=243!) * 94 ms (ttl=243!)
> > 5 nren-gsfc-rtr.nren.nasa.gov (198.10.64.129) 95 ms (ttl=242!) 103 ms (ttl=242!) 94 ms (ttl=242!)
> > 6 * rtr-hpcc-ea.nasa.atd.net (198.119.5.251) 111 ms (ttl=241!) 110 ms (ttl=241!)
> > 7 * rtr-900-giga-a.gsfc.nasa.gov (169.154.32.3) 108 ms (ttl=240!) 113 ms (ttl=240!)
> > 8 jsimpson-h.gsfc.nasa.gov (169.154.161.43) 116 ms (ttl=239!) * 119 ms (ttl=239!)
> > hydra 28#
----- End Included Message -----