Read section 6 (Configuration of LAN Parameters): fficial&client=firefox-a" rel="nofollow" target="_blank">http://www.google.ca/search?q=3com+3c857+manual&ie=utf-... and set it as a DHCP server. NAT simply means that you use a single Internet IP address and the router takes care of internal and external address translation. Common internal IP addresses are 10.x.x.x and 192.168.x.x.
It certainly is a very basic router, but why do you need UPnP?
Look at Figure 11. Is how you have it setup? What's the IP address of the router? If you use static IP addresses instead of DHCP, then you have to specify the default gateway, i.e., the router IP address (by default it is 192.168.1.1).
Your router does NAT automatically; otherwise you wouldn't be able to access the Internet with a static or dynamic IP address that isn't routable (192.168.x.x). Therefore you can't enable or disable NAT since it's always enabled.
Cable (Static:10.50.x.x) > Router (192.168.1.1)> PC (Tried both, not satisfyed - Manual -192.168.1.216 or Auto - 192.168.1.216) > Xbox360 (Tried both - Auto/Manual 192.168.1.215). On the xbox, when I test the conection, it says: You have a problem with the connection: NAT Moderate.
UPnP I don't even know what it is, but on the xbox, it says as a tip to enable UPnP in order to open NAT.
Let's say that cable static IP address is 10.50.1.2. What IP address did you use on the WAN port of your router? It should be 10.50.1.2 and it's LAN address is 192.168.1.1. UPnP (Universal Plug and Play) just makes it easier for devices to communicate, but it isn't required if the router is configured correctly (and it wouldn't help is it isn't).
Yes, I did that.
There's no how to specify if its a UDP or TCP port, but i enabled 53,88 and 3074. No success. Oh, there's no success either if I disable the router's firewall, does that mean something?
Should I enable PING in the router?
There's a Special Application option in the router, which asks me the trigger and the incoming ports, I don't know if that's useful.
And, right now, it says on my xbox that my MTU should be at least 1364, and I'm below that..
Add each required port and forward it to the Xbox.
Example from my Netgear router configuration screen:
Service Name Xbox_88
Service Type UDP
Starting Port (1~65534) 88
Ending Port (1~65534) 88
Server IP Address 192.168.1.215
Service Name Xbox_3074
Service Type TCP/UDP
Starting Port (1~65534) 3074
Ending Port (1~65534) 3074
Server IP Address 192.168.1.215
Service name can be anything you want, at least on my routers. Apparently that's all that's required (port 88 UDP and 3074 TCP/UDP). The above configuration assumes that your Xbox has static IP address 192.168.1.215. You might need to make configuration modifications on the Xbox (my knowledge of the Xbox is nil).
Ok, the xbox live is at maintenance right now, so I'll reply again only tomorrow, when the service is back online.
As for the configurations, on my router, you cannot select TCP or UDP (don't think it'll be a problem).
And, with this configurations on, I'll have to delete my Virtual Server, because I cannot type a port on the virtual server and the same one in authorised applications. But I'll test them both tomorrow (have not tested yet the ports 53,88,3074 with DMZ off).
And, just to add, on the Xbox, the only thing you can configurate is the basic: IP, mask, gateway and DNS.