[CentOS] iptables: comprehensive tutorial for CentOS?

[Adam Tauno Williams]

On Sun, 2010-10-17 at 18:41 -0400, Boris Epstein wrote: 
> Hello listmates,
> I know this may sound stupid... but I am trying to set up a
> firewall/filter/forwarder using CentOS 5.5 machine as a platform and I
> am succeeding but only partially. Fro example, I am literally trying
> to forward HTTP and HTTPS (TCP 80 and 443) from the public interface
> to a private IP and TCP 80 works like a charm whereas TCP 443 seems to
> be a no-go.
> To that effect: does anyone know of a comprehensive relevant manual? I
> mean, I must be doing something wrong here though I ain't sure what.

There is nothing CentOS specific about iptables.  Just check out
<http://www.netfilter.org/>

> Any advice and suggestions much appreciated.

Try the *excellent* fwbuilder application; then you can design your
iptables rules graphically and even install them.
<http://www.fwbuilder.org/>

I know I'll never waste time building iptables rulesets by hand again.
-- 
Adam Tauno Williams <awilliam at whitemice.org> LPIC-1, Novell CLA
<http://www.whitemiceconsulting.com>
OpenGroupware, Cyrus IMAPd, Postfix, OpenLDAP, Samba