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//etc/ppp/firewall-standalone
#!/bin/sh # # firewall-standalone This script sets up firewall rules for a standalone # machine # # Copyright (C) 2000 Roaring Penguin Software Inc. This software may # be distributed under the terms of the GNU General Public License, version # 2 or any later version. # LIC: GPL # Interface to Internet EXTIF=ppp+ ANY=0.0.0.0/0 iptables -P INPUT ACCEPT iptables -P OUTPUT ACCEPT iptables -P FORWARD DROP iptables -F FORWARD iptables -F INPUT iptables -F OUTPUT iptables -F -t nat # Deny TCP and UDP packets to privileged ports iptables -A INPUT -i $EXTIF -d $ANY -p tcp --dport 0:1023 -j DROP iptables -A INPUT -i $EXTIF -d $ANY -p udp --dport 0:1023 -j DROP # Deny TCP connection attempts iptables -A INPUT -i $EXTIF -p tcp --syn -j DROP # Deny ICMP echo-requests iptables -A INPUT -i $EXTIF -s $ANY -p icmp --icmp-type echo-request -j DROP echo 1 > /proc/sys/net/ipv4/ip_dynaddr