14.12. Ttl-inc.txt

Un petit exemple ttl-inc.txt. Il indique comment rendre invisible le pare-feu/routeur aux traceroutes, lesquels révèlent beaucoup d'informations utiles aux attaquants possibles.

#!/bin/bash
#
# ttl-inc.txt - short script to increase TTL of all packets on port 33434 - 33542
#
# Copyright (C) 2001  Oskar Andreasson <bluefluxATkoffeinDOTnet>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program or from the site that you downloaded it
# from; if not, write to the Free Software Foundation, Inc., 59 Temple
# Place, Suite 330, Boston, MA  02111-1307   USA
#

/usr/local/sbin/iptables -t mangle -A PREROUTING -p TCP --dport 33434:33542 -j \
TTL --ttl-inc 1