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Opening port range for ip range

argmagedd0n
Level 1
Level 1

‎07-02-2011 11:59 AM - edited ‎03-03-2019 06:18 AM

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?

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Richard.H.Sims
Level 1
Level 1

‎07-04-2011 03:18 AM

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.

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