Opening Ports in Firewall

[master_b]

I have 3 PC's on a home lan, connected through an ethernet switch to an ADSL Modem/Router, which has basic firewalling built in (Billion 7100)

each PC has a different distro (or 2) - Xandros/Knoppix-Debian/
Mandrake 10 CE/Fedora Core2. One PC also has XP

I need to open ports for internal LAN access for SSH (sshd?)/TightVNC/Samba/ and for external access - Bittorrent.

How do I open these ports safely? especially for the internal use of SSH/TightVNC/Samba?

I have Googled and checked out many sites, tried Firestarter and easyFW GUI's but am still at a loss at this stage.

Any help appreciated.

master_b

[GoldenEye]

You'll need an service filter ip firewall, like IPTABLES.

See:

http://www.linux-firewall-tools.com/linux/

You can see firestarter, it implements iptables rules with a GUI interface.

Let us know your doubts!

[master_b]

Found and installed Guarddog on Mandrake 10.

Selected options to allow Webmin but can only get log-in screen on browser - entering user (root) and password (changed with changepass.pl) is rejected.

Help please.

master_b

[master_b]

Using Guarddog, opened webmin port in firewall, determined that correct "url" for starting Webmin is https://localhost:10000
NOT https://(actuallocalhpstname):10000

Webmin now OK

Thanks
master_b