what is the TTL on transit packets ?

Linux Advanced Routing and Traffic Control

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hi,

I was wondering can I inpect in some easy way what is the current TTL value of a packet i.e. say I have the following config :


comp1 -----> router ---> router2 ----> myMacine ---> router ---> internet
comp2 ---------------------------|

etc....

Now the user at the computer1 or comp2 is browsing or pinging and I want to know/inpect what is the value of TTL on all his packets w/o ever going to manualy ping from its computer....
Does all OSes use same start TTL value or different on different protocols or connection ?

After I see his TTL i would add iptable rule to do some things based on this, so i want to be sure it is a constant value ?

thanx in advance
raptor
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