Opening port range for ip range

[argmagedd0n]

Hi there

I have came up with a strange problem recently, maybe someone else experienced a similar problem and was successful in solving it?

I have a LAN with Cisco 1941 as the only router with NAT that connects it to the internet, with a single public IP. There are many gamer users, and they complain that Call of Duty Modern Warfare 2 sees our network as "strict NAT", while for full gaming experience it needs "open NAT". After a small research I have found out that CoD needs certain port ranges to be forwarded to LAN IPs. Well, I know how to forward a range of ports to a single IP, but how is it possible to forward a port range for all the IPs in the LAN?

[Richard.H.Sims]

As far as I know that's impossible with only one public IP.  A packet would come in and the router would have no idea which IP in a range it needs to be sent to.  You can only forward to one IP inside the NAT.

In home-user land there is uPNP but I don't think it's supported on Cisco branded gear, only their home user Linksys products.