[Gllug] Traceroute query

[Martin A. Brooks]

Hi Richard,

On Sunday, May 30, 2004, Richard Turner wrote:

> Uh, no.  In fact, -t is the only option I don't know anything about and
> that's not a simple on/off thing:

> usage: traceroute [-nFV] [-f first_ttl] [-m max_hops] [-p port]
>            [-S source_addr] [-I interface]
>            [-t tos] [-w timeout] [-q nqueries] host [packetlen]

> It is a NAT issue though I take it?  That's a start at least :o)

From my "man traceroute", note >><< emphasis

       -f     Set the initial time-to-live used in the first outgoing probe packet.
       -F     Set the "don't fragment" bit.
       -d     Enable socket level debugging.
       -g     Specify a loose source route gateway (8 maximum).
       -i     Specify a network interface to obtain the source IP address for outgoing probe packets. This is normally
              only useful on a multi-homed host. (See the -s flag for another way to do this.)
>>     -I     Use ICMP ECHO instead of UDP datagrams.  <<
       -l     Display the ttl value of the returned packet.  This is useful for checking for assymetric routing.


Also:

martin at boole:~$ traceroute -I www.google.com
traceroute: Warning: www.google.com has multiple addresses; using 216.239.59.99
traceroute to www.google.akadns.net (216.239.59.99), 30 hops max, 38 byte packets
 1  my.router (10.119.48.1)  0.397 ms  0.608 ms  0.321 ms
 2  thus1-hg3.ilford.broadband.bt.net (217.32.64.74)  17.640 ms  15.150 ms  15.913 ms
 3  217.32.64.34 (217.32.64.34)  14.842 ms  17.173 ms  15.967 ms
 4  217.32.64.110 (217.32.64.110)  17.987 ms  19.355 ms  17.976 ms
 5  anchor-border-1-4-0-2-191.router.demon.net (212.240.162.126)  19.985 ms  19.365 ms  19.991 ms
 6  195.66.224.125 (195.66.224.125)  21.977 ms  19.399 ms  19.966 ms
 7  216.239.49.254 (216.239.49.254)  27.992 ms  31.566 ms  87.816 ms
 8  216.239.49.121 (216.239.49.121)  31.975 ms 216.239.49.114 (216.239.49.114)  33.389 ms  31.385 ms
 9  216.239.59.99 (216.239.59.99)  26.929 ms  28.365 ms  26.968 ms


Note the start of my route is part of a NAT.  Are you even running
Linux?  "-I" has been a traceroute option for packet for as long as I
can conveniently recall.

Regards

--
Martin A. Brooks, Clues Ltd.
http://www.clues.ltd.uk/

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