Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!SAIC.COM!sparta
From: sparta@SAIC.COM (Sparta guest account)
Newsgroups: comp.protocols.tcp-ip
Subject: Re:  sparta.com
Message-ID: <8912191514.AA02097@SAIC.COM>
Date: 19 Dec 89 15:14:29 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 26

Columbus,

The Internet has been prone to forming repeated routing loops for the
last few days.  Below is an interesting traceroute run from
narnia.saic.com (192.5.8.2) to cj3.centcom.com (131.240.95.31), at
10:00 EST on 19 Dec:

 1  MCLEAN-MB.DDN.MIL (10.3.0.111)  180 ms  120 ms  120 ms
 2  MCLEAN-MB.DDN.MIL (10.3.0.111)  180 ms  100 ms  120 ms
 3  MOFFETT-FLD-MB.DDN.MIL (26.20.0.16)  1180 ms  2220 ms  1540 ms
 4  CAMBRIDGE-MB.DDN.MIL (10.3.0.5)  1340 ms  1360 ms *
 5  MCLEAN-MB.DDN.MIL (10.3.0.111)  2400 ms  1380 ms  1820 ms
 6  * MOFFETT-FLD-MB.DDN.MIL (26.20.0.16)  2060 ms  2860 ms
 7  CAMBRIDGE-MB.DDN.MIL (10.3.0.5)  2100 ms  3360 ms  3720 ms
 8  MCLEAN-MB.DDN.MIL (10.3.0.111)  4240 ms  3520 ms *
 9  131.240.95.31 (131.240.95.31)  2160 ms !  1560 ms !  2280 ms !

There seems to be quite a bit of route thrashing; we have frequently
seen evidence that the routes are changing during a traceroute run
(witness the miraculous discovery of cfm.centcom.com, above!).

This is not an isolated occurrence.  We've been seeing quite a few
loops, especiaslly in traffic to the West coast.  I guess that
includes the West coast of South Florida :-).

- Bob