IMHO the port triggering thing like described by merlin will not work in this scenario.
(Cause AA25-Server isn't sending but just receiving on the trigger-port)
OK, lets go step-by-step:
First of all you should assign a static IP to your server-pc.
HowTo:
http://blog.mclaughlinsoftware.com/2009/11/26/windows-7-static-ip/As your routers IP by default is "192.168.1.1" you need to assign an address within this network range.
(192.168.1.2 - 192.168.1.254)
Lets say: 192.168.1.10
Subnet mask: 255.255.255.0
Default gateway: 192.168.1.1
Preferred DNS: 192.168.1.1
As your router by default has DHCP enabled you need to define a IP-block for DHCP.
(Otherwise there is a possibility of an address collision if your "server-ip" is assigned to another PC connecting to your network)
This can be done at your routers menu:
-DHCP
Start-IP-Address: 192.168.1.100
End-IP-Address 192.168.1.200
Now you can start opening your needed ports.
-Forwarding
--Virtual Servers
>"Add New"
Service port: 1716
IP-Address: 192.168.1.10
Protocoll: UPD
Status: Enabled
>>"Save"
Same again for port "1717":
>"Add New"
Service port: 1717
IP-Address: 192.168.1.10
Protocoll: UPD
Status: Enabled
>>"Save"
You need to open same ports (1716 + 1717) at your windows firewall.
HowTo:
http://windows.microsoft.com/en-us/windows7/open-a-port-in-windows-firewallEven though some people state to have more ports opened to get the server work this isn't true.
All others ports are an inside-out connection which do not need port forwarding at all.
If you have further questions dont hesitate to ask.