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one method is to put it on the net, run nmap or similar app from another machine (well, ought to work from the same machine too, but it doesn't hide those ports that are set to DROP all traffic, so it's not quite the same) to determine which ports are open and which closed. then the ports can be closed either by closing the services that are open on them, or then by a firewall like iptables if it's enabled in your kernel....probably is if it's a stock one
You don't need a second machine to run nmap. All you need to do is point nmap at your eth0 ip. "nmap eth0ip" eth0ip being your ip address, of course use your favorite flags.. But I agree netstat -anp is better.
Last edited by peacebwitchu; 11-18-2004 at 09:38 PM.