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Re: MAE-east weirdness
From: "Karl Denninger, MCSNet" <karl () mcs com>
Date: Mon, 8 May 1995 14:19:16 -0500 (CDT)

Hey folks.

I'm working with my friends at National Public Radio. They're having 
network problems, and I'm not sure the correct people at UUNet to report 
this anomaly to. The answer NPR got from UUNet was: MFS trouble in 
Dallas. Does that make sense?

any suggestions?

thanks in advance. sorry for the interruption.

# /usr/local/bin/traceroute npr.org
traceroute to npr.org (199.0.132.69), 30 hops max, 40 byte packets
 1  router.butterfly.net (199.73.40.1)  7 ms  5 ms  3 ms
 2  s0.router.clark.net (199.73.41.254)  12 ms  15 ms  12 ms
 3  sl-dc-1-S19-T1.sprintlink.net (144.228.4.1)  19 ms  29 ms  17 ms
 4  sl-dc-8-F0/0.sprintlink.net (144.228.20.8)  21 ms  19 ms  17 ms
 5  sl-mae-e-H2/0-T3.sprintlink.net (144.228.10.42)  26 ms  18 ms  19 ms
 6  Vienna1.VA.Alter.Net (192.41.177.249)  26 ms  297 ms *
 7  sl-mae-e-F0/0.sprintlink.net (192.41.177.241)  22 ms  31 ms  44 ms
 8  Vienna1.VA.Alter.Net (192.41.177.249)  62 ms  87 ms *
 9  sl-mae-e-F0/0.sprintlink.net (192.41.177.241)  37 ms  36 ms  28 ms
10  Vienna1.VA.Alter.Net (192.41.177.249)  63 ms  83 ms  77 ms
11  sl-mae-e-F0/0.sprintlink.net (192.41.177.241)  21 ms  32 ms  27 ms
12  Vienna1.VA.Alter.Net (192.41.177.249)  40 ms  50 ms  68 ms
13  sl-mae-e-F0/0.sprintlink.net (192.41.177.241)  33 ms  19 ms  31

--Dave
http://iron.butterfly.net/motodave

Well, at a zero-level information point (which is all I have from here :-)
this looks like Sprintlink thinks that network is reachable via Alternet,
and Alternet thinks it is reachable via Sprintlink.

Thus the looping.  I'd contact the respective NOCs and let them hash it out.
At least one of these two is (obviously) wrong. :-)

--
--
Karl Denninger (karl () MCS Net)| MCSNet - The Finest Internet Connectivity
Modem: [+1 312 248-0900]     | (shell, PPP, SLIP, leased) in Chicagoland
Voice: [+1 312 248-8649]     | 7 POPs online through Chicago, all 28.8
Fax: [+1 312 248-9865]       | Email to "info () mcs net" for more information
ISDN: Surf at Smokin' Speed  | WWW: http://www.mcs.net, gopher: gopher.mcs.net


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