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From: ron@BRL-TGR (Ron Natalie)
Newsgroups: net.unix-wizards
Subject: Re:  Time to live values for IP networks.
Message-ID: <8829@brl-tgr.ARPA>
Date: Fri, 1-Mar-85 13:03:58 EST
Article-I.D.: brl-tgr.8829
Posted: Fri Mar  1 13:03:58 1985
Date-Received: Mon, 4-Mar-85 06:21:45 EST
Sender: news@brl-tgr.ARPA
Lines: 12

Every module that processes a packet should decrement time to live by
the number of seconds that it has the packet (minimum of 1 if less than
one second).  What a counts as a module is unclear.  In the gateways
we use, I decrement it once on the way in, and if the packet is not
for the gateway itself, once on the way out.


You just pick a time to live value that you think is reasonable to get
it to the destination.  Note that the old 4.1 TCP code used to decrement
ttl by 5 on input and output.  This seemed a little excessive.

-Ron