Opening NAT - 3c857

Hello,

I have this 3com 3c857 router, which i want to open the NAT so i can play on xbox live..

I searched everywhere and did find nothing.

Can anybody show me a tutorial on doing this?

Thank you very much.

Read section 6 (Configuration of LAN Parameters): http://www.google.ca/search?q=3com [...] mozilla:frfficial&client=firefox-a 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.

But if you click that google page, you'll download the manual from http://support.3com.com/infodeli/t [...] final2.pdf

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.

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).

If you can access the Internet and the Xbox doesn't work properly, then you need to set port forwarding for the following to 182.168.1.215:

* TCP 80
* UDP 88
* UDP 3074
* TCP 3074
* UDP 53
* TCP 53

UPnP would do that for you, but your router doesn't have that feature. Does it at least support port forwarding?

Don't use the DMZ. In the Virtual Server section, the DMZ is set to 192.168.1.0 which basically denies access.

As per the instructions, click New.

Server IP address: 192.168.1.215 (Xbox)
Local Service: - Custom -
Custom Service Name: Xbox (or whatever you want)
Specify Custom Service Ports: 88,3074 (and you might need to also add 53)

Is this what you've done?

You can enable ping on the router. Your problems have to be with port redirection.

You lose nothing using it to configure port forwarding.

Why is your MTU that low? It should normally be between 1450 and 1500 (only if you don't use PPPoE).

It allows to detect the availability of hosts. If I can ping a host and get a reply, then I know that host exists and that it should be live.

They should be the ones that are specified for the Xbox (53,88,3074).

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, just tried it and.. no, it does not work !

As I said, not even disabling the router't firewall can make my NAT open. Shouldn't that mean something? Maybe it's not a router problem, I don't know..

Any other suggestions?