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- #!/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
-
- ipchains -P input ACCEPT
- ipchains -P output ACCEPT
- ipchains -P forward DENY
-
- ipchains -F forward
- ipchains -F input
- ipchains -F output
-
- # Deny TCP and UDP packets to privileged ports
- ipchains -A input -l -i $EXTIF -d $ANY 0:1023 -p udp -j DENY
- ipchains -A input -l -i $EXTIF -d $ANY 0:1023 -p tcp -j DENY
-
- # Deny TCP connection attempts
- ipchains -A input -l -i $EXTIF -p tcp -y -j DENY
-
- # Deny ICMP echo-requests
- ipchains -A input -l -i $EXTIF -s $ANY echo-request -p icmp -j DENY
-
-