I'm new to opening up ports in CentOS. I need to open up tcp port 8080 and have installed/ran nmap to find it is not open already. I've been reading about the iptables command, I have v1.3.5 installed but I really don't know where to start with it regarding opening up this port.
I'd appreciate a code sample or at least a link to a guide to opening this port using iptables (or any other good method.)
Thank you.
Best Answer
I always like to add a comment and limit scope in my firewall rules.
If I was opening up tcp port 8080 from everywhere (no scope limiting needed) for Tomcat I would run the following command
Then make sure to save your running iptables config so that it goes into effect after the next restart
Note: you'll need to have the comment module installed for that part to work, probably a good chance that it is if you are running Centos 5 or 6
P.S.
If you want to limit scope you can use the -s flag. Here is an example on how to limit traffic to 8080 from the 192.168.1 subnet