From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ulrich Weber <uw@imos.net>
Subject: ICMP TTL=255
Date: Wed, 05 Mar 2003 14:32:05 +0100
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Hi,

I don't think that it's iptables fault, but I don't know where to ask else.
ICMP Ping ignores the TTL value of net/ipv4/ip_default_ttl and use 255.

All other traffic use the net/ipv4/ip_default_ttl value.

Greets
  Ulrich