How to Open Several Ports to Host a Game

Hi, I'm trying to host an internet game that requires several ports using UDP.
What is the proper syntax to open up a range of ports and then several other specific ones all for the same application? Can I list them all in the Public UDP Port(s) box like this: *5120-5300, 6500, 6667, 27900, 28900* ?
Is it really necessary to bypass DHCP and assign a Static IP? What if I check to see what IP DHCP has given me and then put that into Airport?

Well, I did some searching on the game's technical support forum, and came across this excellent port forwarding website: www.portforward.com
They give instructions for an extensive list of routers, of which the Airport Extreme is one: http://www.portforward.com/routers.htm
They also list a ton of applications, the ports they use, and how to configure your chosen router to use them. Here's what they say about the Airport Extreme:
"The AirPortExtreme will not allow you to forward enough ports, to run Neverwinter Nights. You should try using the DMZ portion of this router if it is available. Alternatively you can try switching the router to bridged mode. You will need to contact your ISP to switch to bridged mode, so they can make the required changed on their end. "
It looks like I'll have to try the DMZ approach as the second poster suggested. Bummer.

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I'm a bit confused about my small rmi program.
It seems that more ports are opened than I expected, which could give firewall-problems if we're not careful.
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Can I avoid thisWhy would you want to avoid it?
or should'nt it disappear after the object is bound ?Why?
why is there suddenly an active connection with 2171 ?Either also for DGC purposes or for a client connection. Why do you think this is a problem?
Can I avoid thisWhy would you want to avoid it?
or should'nt it disappear after the object is bound ?Why?
     super(220);Why are you using a reserved port number here? Port 220 is reserved for IMAP v3 servers. See [RFC 1700|http://www.ietf.org/rfc/rfc1700.txt]. Use a port number above 1024 please.
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