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I wasn't 100% sure with the Destination Mask, but it was either 255.255.255.0 or 255.255.255.255 as you found.

To do your Xbox would be identical. Just add another rule (or rules) in there for the required ports.
 
Ok then, awesome. I guess I'll just do that if I ever have problems with any online thing, and I thought port forwarding was a load of crap :p.
 
One more question. To open a 360 port, would I keep the IP addresses the same, my Mac ones? Or would it need a different IP address?
 
The 360 would have a different IP address. If you check in the LAN clients part with the Xbox on, it may show up.
 
Two last questions :).

"Once logged in, click the Advanced tab at the top of the configuration pages, followed by clicking LAN Clients in the list on the left. The bottom half should show an IP address that matches your Mac static IP address from the Network Preference pane ([xx.xx.xx.xx] that I posted earlier). Select the reserve option next to this entry, then click Apply."

Do I need to do that step for the 360's IP? And what IP would I type in? I would assume it would be the one ending in .104 but I wanna make sure I have the right one.

Picture2-3.png
 
If you do that part in the LAN clients, even with DHCP enabled on the 360, the IP address should remain the same. The address that is shown on your screen shot is the address that the ports need to be forwarded to (.104).
 
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