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Configure the iptables to keep your linux box secure or install a firewall like shorewall, first enable the ip_forward from the
/etc/sysctl.conf and then run the sysctl -p for the changes to take effect:

# Uncomment the next line to enable packet forwarding for IPv4

net.ipv4.ip_forward=1

Now run the command:

sysctl -p

To list your current iptables rules run the command:

iptables -l

To save your current iptables rules run the command:

iptables-save Or save to a file:

iptables-save > iptables-config

To delete all the iptables rules run the command:

iptables --flush

These are the already configured rules for a network running the web and mail server,with forwarding and masquerading
enabled,
run the restore command to restore from the file iptables-config :

iptables-restore < iptables-config

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