Port mapping in Windows XP Professional

OK. ICS or NAT - which are you using ?

some relevant comments.

From: AvonWyss    Date: 03/13/2001 08:37AM PST ICS internet sharing proxy on win2k Server not ISA.
 Yes there is. Go to Routing & Remote Access, chose to manually configure and start the service if asked.

 Open IP-Routing. Right-click on "General" and choose "New Routing Protocol". Add the "Network Address
                 Translation" (NAT) protocol. Goto the NAT protocol.
 Add your internet connection (using the contect menu) as public interface with TCP/UDP header translation
                 enabled.
                 Add your private NIC(s) as private interfaces.
                 Goto static routes and add a route for "0.0.0.0", mask "0.0.0.0" with your internet gateway (if on a
                 NIC card) and a metric of 100 or so.

  This should be working now. You can change the options for the NAT and add mapped ports etc. using the  context menu.
 Routing and RAS is not a proxy, thus it does not check the requests made by name or URL. However, you  can define filters for each netowrk interface, including IP range and ports to be locked out (or to  have exclusive access).
This will allow you to define simple rules depending on the IP or IP range. You could also block port 80 and use another proxy software to do more detailed filtering, while still allowing all other traffic  to be handled by the NAT.

From: andyalder   Date: 09/04/2001 05:32AM PST
   The second screen of the RRAS connection wizard allows ICS or NAT, not both. Which did you pick???

    If you picked ICS then disable the DHCP service as ICS provides it's own DHCP agent.

     If picked NAT then ensure the DHCP service is running and had a router (03) option of your servers 192.168.0.1.
               There's more to it than this but confirm whether ICS or NAT first.
  From: Kong     Date: 09/04/2001 06:26AM PST
     Hi Andy, I chose NAT on the second screen...

  Sorry about the confusion, on the first screen, I selected ICS and on the second screen, I selected
               NAT...
 From: andyalder   Date: 09/04/2001 06:45AM PST
               Under RRAS, ip routing NAT check that the 2 interfaces properties in case you have the inside interface   defined as the external interface (unlikely).
 From: andyalder   Date: 09/04/2001 09:38AM PST
               I'm not sure, I always use a firewall or setup the router to filter unwanted traffic. Probably the router
               itself is performing NAT in which case no incoming ports would be forwarded to your server anyway, just
               replies to it's own packets.
How to Configure Input Filters for Services That Run  Behind Network Address Translation NAT
http://support.microsoft.com/support/kb/articles/Q254/0/18.ASP might be worth a read.

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I hope this helps !