Software Firewalls
If you don't have a router and don't plan on getting one or if you have one but are bordering on paranoia, you might want to consider using a software firewall, in particular one of the most popular software firewalls available for Linux, Firestarter.
You can get Firestarter via the Ubuntu Software Center by searching for firestarter and installing it. Once it is installed, run it by selecting System ▸ Administration ▸ Firestarter (you might be asked for your password). Firestarter will open with a self-explanatory setup wizard the first time. Just read each screen carefully; make whatever selection are suggested, if any; and click the Forward button in each of the wizard screens until you get to the last one (shown in Figure 19-2 ...
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