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Network Security Pen-Test
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Re: getting different ttl values for the same IP

Subject: Re: getting different ttl values for the same IP
Date: Wed, 28 Dec 2005 12:26:30 -0500
While performing a TCP traceroute using cain&able i got different ttl values 
for the same ip, can anyone explain about this


10.10.10.10;401 ms (TTL=230) - TTL exceeded;411 ms (TTL=230) - TTL 
exceeded;500 ms (TTL=230) - TTL exceeded;(Unknown)

10.10.10.10;400 ms (TTL=106) - Echo Reply;401 ms (TTL=102) - Echo Reply;400 
ms (TTL=102) - Echo Reply;(Unknown);


Hmm, well the first packet is a TTL exceeded message.  Do you suppose
the RFCs call for a high TTL for that specific message, since one would
want to be sure it doesn't also die due to TTL issues?  This is just
speculation, but it would make sense...  The max TTL is of course 255,
so maybe that box is 25 hops away?

tim

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