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Check here for common ports. As for klaun, looks like a KDE Launcher type listner. If your firewall is configured not to accept any external traffic on those ports, you should be OK. Are you running KDE as your desktop?
Let me ask some more questions here.
I'm using regular dialup w/ my isp, which is using dhcp for assigning tcp/ip addresses. Can I still configure a firewall and use it in a way that won't be obtrusive for me? On RH 7.3, what exactly is the firewall called?