[PLUG] Odd ping response behavior from private IP addresses
Matt Alexander
m at netpro.to
Sat Aug 3 05:36:26 UTC 2002
On Fri, 2 Aug 2002, J Henshaw wrote:
> A traceroute would help clarify things.
Hmm... looks like it's bouncing between two systems until the 30 hop
limit is reached.
traceroute to 172.16.1.5 (172.16.1.5), 30 hops max, 38 byte packets
1 10.32.128.1 (10.32.128.1) 18.855 ms 12.777 ms 12.239 ms
2 ip68-2-1-5.ph.ph.cox.net (68.2.1.5) 30.117 ms 11.570 ms 11.076 ms
3 chnddsrc01-gew0303.rd.ph.cox.net (68.2.14.5) 35.806 ms 33.819 ms 17.413 ms
4 ip68-2-1-5.ph.ph.cox.net (68.2.1.5) 144.879 ms 14.416 ms 40.034 ms
5 chnddsrc01-gew0303.rd.ph.cox.net (68.2.14.5) 13.868 ms 55.412 ms 17.750 ms
6 ip68-2-1-5.ph.ph.cox.net (68.2.1.5) 18.584 ms 15.195 ms 15.042 ms
7 chnddsrc01-gew0303.rd.ph.cox.net (68.2.14.5) 39.512 ms 19.261 ms 11.061 ms
8 ip68-2-1-5.ph.ph.cox.net (68.2.1.5) 36.169 ms 19.474 ms 84.519 ms
9 chnddsrc01-gew0303.rd.ph.cox.net (68.2.14.5) 26.928 ms 26.657 ms 29.603 ms
10 ip68-2-1-5.ph.ph.cox.net (68.2.1.5) 13.232 ms 25.648 ms 45.739 ms
etc...
traceroute to 172.16.1.6 (172.16.1.6), 30 hops max, 38 byte packets
1 10.32.128.1 (10.32.128.1) 13.288 ms 26.473 ms 24.076 ms
2 ip68-2-1-5.ph.ph.cox.net (68.2.1.5) 167.170 ms 48.484 ms 84.706 ms
3 chnddsrc01-gew0303.rd.ph.cox.net (68.2.14.5) 49.574 ms 58.097 ms 27.378 ms
4 ip68-2-0-2.ph.ph.cox.net (68.2.0.2) 94.635 ms 29.016 ms 49.975 ms
5 chnddsrc01-gew0304.rd.ph.cox.net (68.2.14.9) 13.953 ms 84.942 ms 58.122 ms
6 ip68-2-0-2.ph.ph.cox.net (68.2.0.2) 13.596 ms 93.175 ms 16.689 ms
7 chnddsrc01-gew0304.rd.ph.cox.net (68.2.14.9) 11.721 ms 146.168 ms 86.775 ms
8 ip68-2-0-2.ph.ph.cox.net (68.2.0.2) 21.260 ms 22.275 ms 20.621 ms
9 chnddsrc01-gew0304.rd.ph.cox.net (68.2.14.9) 16.112 ms 60.123 ms 53.734 ms
10 ip68-2-0-2.ph.ph.cox.net (68.2.0.2) 27.901 ms 16.402 ms 15.778 ms
etc...
OK, so that explains the "Time to live exceeded" message from ping, but
how would these systems have to be configured in order to produce these
results?
~M
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