[Gllug] Guarddog firewall question

[Paul Cupis]

Emon wrote:
> I am running the Guarddog firewall application which is a GUI front-end
> for iptables.
> 
> My email provider (nerdshack.com) allows smtp on port 25 & 2525. My ISP
> has port 25 blocked but has 2525 open (after I requested them). I am not
> all that tech savvy when it comes to network & stuffs. I have no clue
> how to configure iptables; but using the Guarddog GUI I enabled smtp
> outgoing, which by default opens port 25. So (using the GUI) I made a
> custom protocol (base on my instincts) which is as follows
> 
> Name: SMPT2
> Type: TCP
> Port: 2525
> 
> and voa-la!! Things are working fine, I am able to send mail fine.
> So before I rush off to my friends to boast & babble about my immense
> talent in configuring firewalls blindly, without having to know anything
> about them :-)..... I would be very grateful if someone could kindly
> confirm if the procedure I followed is OK!! or have I opened some kind
> of a potential security hole??!!

If you have set the custom protocol to TCP only and non-bidirectional,
and then enabled it in the protocols tab for "Protocol served from zone
'Internet' to clients in zones...local" then you should be fine, with no
unnecessary ports open.
-- 
Gllug mailing list  -  Gllug at gllug.org.uk
http://lists.gllug.org.uk/mailman/listinfo/gllug