Hi
I have slackware 12 and shorewall fire wall with only one interface (stand alone) and a Dell router.

I wanted to test the effectiveness of the firewall so I went to a few websites that test for open ports. Sure enough all ports had shown as secure. I turned off the firewall and cleared the settings. Did the test again and still all ports were secure.

I figured I had my router to thank for the secure ports.

I set the rules to only allowing www. Everything else is dropped.
And yet, I am able to retrieve my emails through Thunderbird.

My questions is #1 wouldn't shorewall keep me from retrieving my emails since the only rule allowed for searching the web?

#2 How do I test that Shorewall is actually working since it appears that the router is keeping all of the ports secure and not Shorewall?