On a Mac you should always keep the Apple knowledge article "Well Known" TCP and UDP ports used by Apple software products bookmarked.
Plus if you buy a router make sure you check that router's manual/web page handy. Each router manufacture have different ways of opening/closing logical ports.
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PowerMac G5 Dual 1.8(Rev A.), , 7 Gig RAM, Pioneer DVR-110, ATI X800XT, OS X 10.4.11 & 10.5.4, 23'' HD LCD
Mac Book Pro Core 2 Duo 2.16Mhz, SuperDrive, ATI X1600, 2GB RAM, OS X 10.5.4
Tibook 400Mhz, DVD drive, 1024 RAM, ATI Rage, OS X 10.4.7
1TB Time Capsule
5g iPod 30Gig White |