I have just discovered an interesting disparity in the interfaces that are
reported by traceroute and ping:
[lannet@hero lannet]$ /usr/sbin/traceroute auf.asn.au
traceroute to auf.asn.au (203.37.104.194), 30 hops max, 40 byte packets
1 janus (203.41.237.73) 1.033 ms 0.837 ms 0.804 ms
2 gw.alb2.Albury.telstra.net (139.130.60.65) 142.913 ms 139.184 ms
139.711 ms
3 Ethernet0.alb1.Albury.telstra.net (139.130.240.33) 129.828 ms
144.659 ms 139.781 ms
4 Serial5-5.lon-core2.Melbourne.telstra.net (203.50.76.5) 169.701 ms
134.392 ms 159.696 ms
5 GigabitEthernet3-0.lon-core3.Melbourne.telstra.net (139.130.239.246)
149.841 ms 153.376 ms 159.915 ms
6 Pos5-0-0.civ-core1.Canberra.telstra.net (203.50.6.82) 169.874 ms
154.803 ms 159.817 ms
7 Ethernet0.civ6.Canberra.telstra.net (139.130.235.77) 169.715 ms
167.130 ms 159.867 ms
8 scout.auf.asn.au (139.130.12.218) 309.721 ms 428.678 ms 299.823 ms
9 stratos.auf.asn.au (203.37.104.194) 429.551 ms 288.717 ms 419.700
ms
[lannet@hero lannet]$ ping -Rc1 auf.asn.au
PING auf.asn.au (203.37.104.194): 56 data bytes
64 bytes from 203.37.104.194: icmp_seq=0 ttl=247 time=466.5 ms
RR: hero.lannet.com.au (203.41.237.74)
janus.lannet.com.au (139.130.60.92)
Ethernet0.alb2.Albury.telstra.net (139.130.240.34)
Serial0.alb1.Albury.telstra.net (203.50.76.30)
Fddi0-0.lon-core2.Melbourne.telstra.net (139.130.239.227)
Pos2-0.lon-core3.Melbourne.telstra.net (203.50.6.81)
Ethernet1-0.civ-core1.Canberra.telstra.net (139.130.235.65)
scout.auf.asn.au (203.37.104.193)
stratos.auf.asn.au (203.37.104.194)
--- auf.asn.au ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 466.5/466.5/466.5 ms
Notice how traceroute appears to always report the inbound interface,
whereas ping reports the outbound interface.
Does anyone want to offer an explanation as to why. I suppose it is
really pretty arbitary.
Howard.
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LANNet Computing Associates <http://www.lannet.com.au>
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