[Firewall] iptables Configuration

iptables usage:

Add Rules:
iptables -I INPUT -p tcp --dport  -j ACCEPT
iptables -I INPUT -p tcp --dport  -j ACCEPT
iptables -A INPUT -i eth0 -p tcp -s  --dport  -m state --state NEW,ESTABLISHED -j ACCEPT

Save Rules:
service iptables save
OR  /etc/rc.d/init.d/iptables save

Read Status
service iptables status
OR /etc/rc.d/init.d/iptables status

iptables -nvL --line-number

Delete Rules
iptables -D INPUT 

Update Rules
iptables -R INPUT  -j ACCEPT