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so, how can a generic low level firewall distribution only allow IP's based an obscure setting within a remote high level non-gpl client application? I can't think of a good reason why that should be even possible. the two are so totally unrelated besides them being on a network... you obviously can block by I Pon ipcop, but you'd need to add them manually or somehow export the skype list to something ipcop can read... i can't see that realy happening, but it may be possible.
well everything is blocked by default, you just need to add them on to the access list. i really can't see how that's hard in ipcop, the interface is pretty small. you just need to firstly open the access, and then port forward that port to your machine.