ports, ports, ports
 

Hi,

How can use ports...like have them open to listen to incoming connections but then have them close again so that I would pass at shields up.

I also have a linksys router which has port forward and port trigger.
But there is not much sense in having router firewall if you must have ports constantly open, right?

Could I use port trigger instead of port forward? I want app to be able to listen well. but I do not want to have my system running wide open.

check and read the man of iptables...