Configuring iptables

IMAP

Runs on port 143, so

iptables -A INPUT -p tcp -s 0/0 --sport 1024:65535 -d 202.54.1.20 --dport 143 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp -s 202.54.1.20 --sport 143 -d 0/0 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT

See:

• http://www.cyberciti.biz/tips/linux-iptables-13-how-to-allowopen-imap-serverprotocol.html

Flushing Rules

#!/bin/sh
echo "Stopping firewall and allowing everyone..."
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT

See:

• http://www.cyberciti.biz/tips/linux-iptables-how-to-flush-all-rules.html