stine@SPARTA.COM (Robert Havens Stine) (12/09/89)
An ftp connection between heisenberg.sparta.com & devvax.tn.cornell.edu hung, so I ran traceroute from a nearby host (narnia.saic.com) to see what was going on. Answer: duelling gateways! traceroute output follows, from narnia.saic.com toward devvax.tn.cornell.edu, on 8 Dec, about 20:50 EST: 1 MCLEAN-MB.DDN.MIL (10.3.0.111) 80 ms 220 ms 120 ms 2 MCLEAN-MB.DDN.MIL (10.3.0.111) 100 ms 120 ms 120 ms 3 CAMBRIDGE-MB.DDN.MIL (10.3.0.5) 1060 ms 1020 ms 800 ms 4 MCLEAN-MB.DDN.MIL (26.20.0.17) 1000 ms 660 ms 640 ms 5 CAMBRIDGE-MB.DDN.MIL (10.3.0.5) 2120 ms 1200 ms * 6 MCLEAN-MB.DDN.MIL (26.20.0.17) 1600 ms 1620 ms 1900 ms 7 CAMBRIDGE-MB.DDN.MIL (10.3.0.5) 1580 ms 1620 ms 1740 ms 8 * * * What a ride! In fairness, I ought to add that coherent routes were reestablished in 20-30 minutes. Note: the McLean mailbridge entry is repeated at hops 1 & 2 because vienna.saic.com, narnia's entry gateway, does not check the TTL field. - Bob Stine