Start with the howto's they are fairly straight forward and easy to understand. Then a good book, New Rider has one that I use a lot (can't remember title).
As for what to allow, the best policy security wise is to deny all, then allow
in only what you need. For example my home box only allows ssh(port 22), my mailserver only allows ssh(port 22), sendmail(port 25), and secure pop3(port 995), and my web server only ssh(port 22), and httpd(port 80).
Jeff
jay wrote:
anyone know anything about iptables??? I want know what could pose a
potential security risk how and what to not allow....
-- Jeff Largent ImageLinks, Inc.
