XBox Live on shared network where port forwarding is not an option
I have a growing population of XBox users who want to use XBox Live. They are all on my network sharing a single internet-facing IP address in a standard many-to-one NAT setup.
The XBox tests their connectivity and gives it a rating of "Strict NAT". It recommends port numbers that I should "open". I have checked and those ports are not blocked by the firewall. The next step would be port forwarding, but obviously I could only do that for one lucky user. It also recommends enabling UPnP, but Sonicwall does not support UPnP. I doubt UPnP would work in a shared environment even if they did.
Research indicates that my Sonicwall NSA4500 simply will not support it no matter what I do. At best I could buy enough internet-facing IP addresses to give each of them one-to-one NAT and even then they'd only get up to a rating of "Moderate NAT".
Does anyone here have a similar configuration, either with a Sonicwall firewall or a different brand?