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Re: Failure traceroute
- To: Steve Glines <sglines@is-cs.com>
- Subject: Re: Failure traceroute
- From: Simon Leinen <simon@limmat.switch.ch>
- Date: 29 Sep 2000 16:51:43 +0200
- Cc: Aroot Mailing list <aroot@ops.ietf.org>
- Delivery-date: Fri, 29 Sep 2000 07:52:20 -0700
- Envelope-to: aroot-data@psg.com
- User-Agent: Gnus/5.0807 (Gnus v5.8.7) Emacs/20.4
>>>>> "sg" == Steve Glines <sglines@is-cs.com> writes:
> Here is a traceroute of the current failure:
^^^^^^^^
As I explained in a previous mail, the error lies in Harald's script,
which insists on the last hop listed by traceroute being
"aroot.psg.com". The aroot.psg.com you successfully traced the route
to simply uses a different IP source address in the ICMP packet that
traceroute receives (note that the destination address is included
elsewhere in the ICMP packet, but traceroute doesn't show it).
Note that Microsoft's TRACERT program does see the anycast address,
because it uses ICMP ECHO requests rather than UDP packets to
purportedly unused ports. Sorry for this politically incorrect remark.
Regards,
--
Simon.
> traceroute to aroot.psg.com (192.83.230.1), 30 hops max, 40 byte packet
> 9 bbr01-p4-0.whkn01.exodus.net (209.185.249.37) 30.774 ms 30.780 ms
> 10 ibr01-g4-0.whkn01.exodus.net (216.35.65.86) 31.382 ms 31.316 ms
> 11 p4-1.nycmny1-cr1.bbnplanet.net (4.24.152.149) 31.278 ms 31.524 ms
> ms
> 12 p2-0.nycmny1-cr2.bbnplanet.net (4.24.7.30) 30.948 ms 31.672 ms 3
> 13 p0-0.swisscom2.bbnplanet.net (4.24.153.166) 33.443 ms 33.839 ms
> 14 i00nye-005-pos3-0-0.ip-plus.net (164.128.236.57) 31.282 ms 31.606
> 65 ms
> 15 164.128.236.70 (164.128.236.70) 33.180 ms 31.970 ms 31.370 ms
> 16 swiEG1-P1-0-0.switch.ch (192.65.93.249) 121.275 ms 119.479 ms 11
> 17 swiGEX-A4-0-7.switch.ch (130.59.33.117) 128.158 ms 128.391 ms 13
> 18 swiCE1-A4-0-0-5.switch.ch (130.59.33.66) 128.159 ms 133.217 ms 1
> 19 mbone-cern.switch.ch (192.65.185.100) 125.715 ms * 127.854 ms
> --
> Steve Glines http://www.shore.net/~sglines/resume.html
> voice: 617-484-4358 http://web.belmont.ma.us
> fax: 617-484-4401
> cell: 617-549-7274
--
Simon Leinen simon@babar.switch.ch
SWITCH http://www.switch.ch/misc/leinen/
Who is General Failure & why's he reading my disk?