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Using the terminal I was wondering if it would be possible to see a list of all the active firewalls on a particular system that I have shelled into. I want to be able to see which ports are active pertaining to each firewall, so that I can change the restrictions.

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What OS? What do you mean by "systems using firewalls"? A Firewall typically blocks traffic, with holes poked through it to allow access for a limited set of ports. Is that what you're asking? What ports are opened in the firewall? –  jsbillings May 14 '12 at 18:16
    
Linux, as in which servers are using which firewalls. I wouldn't mind knowing which ports are opened either. –  Jeff May 14 '12 at 18:19
    
What would you do with that information? –  Mat May 14 '12 at 18:37
    
Please, think again about it and write your question when you are sure what you want. Your question doesn't make any sense. –  diegows May 14 '12 at 19:29

2 Answers 2

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You could scan your localhost for open ports using a tool like nmap.

nmap -v -sT localhost

nmap can be built from source or installed from the repo of most (if not all) major distros.

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A server doesn't use a firewall. You set up a firewall to block or allow ports. that's it. If you want to look at your firewall settings, try looking at the output of iptables -L. (or iptables -L -n if you don't want it to resolve IPs).

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