From owner-freebsd-net@FreeBSD.ORG  Mon Nov 29 16:24:24 2004
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From: Tomek Tylec <my-buziaki@interecho.com>
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Date: Mon, 29 Nov 2004 17:24:18 +0100
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Subject: Network traffic: ttl
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I found that gateway I use, sometimes receives packets from my FreeBSD
5.3 box with ttl 63. But when I dumped tcp packets (with tcpdump) that
are send from my computer, they always got ttl 64. 

Moreover Linux (Fedora Core 2) running on same computer don't have such
problems.

Also older versions of FreeBSD (5.2.1 for example) work fine (ttl is always
correct). 

It's specially important for me, because my ISP, that owns gateway, use
simple method to check if he have illegal clients - firewall on gateway
drops packets with odd ttl.