RE: [MLUG] traceroute

["Russell Horn" <EMAIL:PROTECTED>]

> 
> He is using Windows, so it probably won't work.  Maybe he can 
> get to a Linux box, run "man traceroute" and assume that the 
> three columns of milliseconds mean the same thing in both OSs.
> 

Or could type man traceroute into the search box on google...

Anyway,  Traceroute Man page extract from Linux

This program attempts to trace the route an IP packet would follow to
some internet host by launching UDP probe packets with a small ttl (time
to live) then listening for an "time exceeded" reply from a gateway. We
start our probes with a ttl of one and increase by one until we get an
ICMP "port unreachable" (which means we got to "host")

Line is printed showing the ttl, address of the gateway and round trip
time of each probe. If the probe answers come from different gateways,
the address of each responding system will be printed. If there is no
response within a 3 sec. timeout interval, a "*" is printed for that
probe.
A sample use and output might be:
traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms
2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms
5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms
6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms
7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms
8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms
9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms
10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms
11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms

Note that lines 2 & 3 are the same. This is due to a buggy kernel on the
2nd hop system \- lbl-csam.arpa \- that forwards packets with a zero ttl
(a bug in the distributed version of 4.3

Note that you have to guess what path the packets are taking
cross-country since the NSFNet (129.140) doesn't supply address-to-name
translations for its NSSes.

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