UNIX for Dummies Questions & Answers

What are the commands to manage ports from my command line.

Example:

Opening Ports, Closing Ports, Viewing their status, etc.

I am having a hard time finding this answer. I'm trying to trouble shoot some networking problems and it would be very helpful if I could just do this from the command line.

syregnar86,


is this more on firewall(opening ports/closing ports) or more into UNIX sockets ports? Are your question related to ports like (ftp / ssh / sftp)

You have to make it clear.

Ports are open and closed by applications ( like ftp / ssh / http). If you close the applicaiton it will also close the port.


To view what ports is intended to what application is it located in /etc/services that file specify some of the known ports. some applications are not there but those who are common are indicated in the mentioned file.

To view any existing ports ( ESTABLISHED / LISTENING ports on your unix machine. you can use the unix command NETSTAT

ex:
netstat -an | grep ESTAB

hope that helps.