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List:       nessus
Subject:    RE: tcp-traceroute
From:       "DePriest, Jason R." <jrdepriest () firsthorizon ! com>
Date:       2004-10-26 17:16:31
Message-ID: F67AB1DD14544242BE5BFE94F5939175018D7927 () E2KMEMMCS1 ! ftbco ! ftn ! com
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On Tuesday, October 26, 2004 9:54 AM, Renaud Deraison wrote
> 
> Run tcpdump while the tcptraceroute is going on :
> 
> # tcpdump -ln 'icmp and ( icmp[0] = 3 or icmp[0] = 11)'
> 
> You'll see the time exceeded in transit error messages popping up.
> 

I did just this on our internal network and compared the results of a
regular traceroute and tcptraceroute.
My system is three hops away from the target.

traceroute generated:
12:01:04.435254 IP 10.X.W.253 > 10.X.W.19: icmp 36: time exceeded
in-transit
12:01:04.464384 IP 10.X.W.253 > 10.X.W.19: icmp 36: time exceeded
in-transit
12:01:04.467502 IP 10.X.W.253 > 10.X.W.19: icmp 36: time exceeded
in-transit
12:01:04.470206 IP 10.X.Y.251 > 10.X.W.19: icmp 36: time exceeded
in-transit
12:01:04.474800 IP 10.X.Y.251 > 10.X.W.19: icmp 36: time exceeded
in-transit
12:01:04.477442 IP 10.X.Y.251 > 10.X.W.19: icmp 36: time exceeded
in-transit
12:01:04.479522 IP 10.X.Z.2 > 10.X.W.19: icmp 36: 10.226.15.2 udp port
33441 unreachable
12:01:04.484193 IP 10.X.Z.2 > 10.X.W.19: icmp 36: 10.226.15.2 udp port
33442 unreachable
12:01:04.487784 IP 10.X.Z.2 > 10.X.W.19: icmp 36: 10.226.15.2 udp port
33443 unreachable

while tcptraceroute generated:
12:01:16.581593 IP 10.X.W.253 > 10.X.W.19: icmp 36: time exceeded
in-transit
12:01:16.585319 IP 10.X.W.253 > 10.X.W.19: icmp 36: time exceeded
in-transit
12:01:16.594272 IP 10.X.Y.251 > 10.X.W.19: icmp 36: time exceeded
in-transit
12:01:16.597930 IP 10.X.Y.251 > 10.X.W.19: icmp 36: time exceeded
in-transit
12:01:16.603119 IP 10.X.Y.251 > 10.X.W.19: icmp 36: time exceeded
in-transit

So tcptraceroute does use ICMP messages.  It did generate fewer packets
that match the filter, so maybe it does it more efficiciently, but it
does use them.

-Jason

PS - I apologize in advance for the legal disclaimer at the bottom of my
email message.  This is tacked on by our SMTP gateway and I have no
control over it.
-- 

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