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Securing Linux Systems With Host-Based Firewalls Implemented With Linux iptables

Jan 30, 2004

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Removing the Firewall Rule Set

The following script is useful when you want to remove the firewall rule set from the kernel:

#!/bin/sh
FW="/sbin/iptables"
$FW –flush # clear all firewall chains
$FW –delete-chain # delete all user-defined chains

# set the default action of the built-in chains to ACCEPT, the default at boot time
for ch in INPUT OUTPUT FORWARD; do
 $FW -P $ch ACCEPT
done

We suggest storing this script in /etc/sun_fw/removefw.sh.

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