IpTables
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For example, save current iptables firewall rules:
# iptables-save > /root/dsl.fw
To restore iptables rules:
# iptables-restore < /root/dsl.fw
To Save the rules to /etc/sysconfig/iptables file:
# /etc/init.d/iptables save
To Restore the rules from /etc/sysconfig/iptables file:
# /etc/init.d/iptables start
Information from http://www.cyberciti.biz/faq/how-do-i-save-iptables-rules-or-settings/