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