IPTABLES Configuration -------Help

[Saif]

Hi All,
Good Day........
My mail and DNS server runs with RedHat Linux9.0. Both of the server uses public IP Address. Each server has one NIC card eth0.

My DNS Server also configured as squid proxy. My mail server is configured with sendmail and also as samba.

What IP tables I should put to implement security?

I will appreciate if any one can help me.....implementing secuirity for these two servers. I am suffering for last couple of days.

Please be informed that I have a cisco 3700 series router and 4 subnets in my LAN. NAT is done in the router.

With thanks
Saif

[Ricky]

You should look for iptables tutorials..  like   www.knowplace.org/netfilter/