Help with NT4.0 as a router

[dpeno]

I have been given the task of bringing backup a moved network. The network is fairly simple. It has a DSL line connected to a NT4.0 server box that has 2 network cards. One card connects to the DSL line and the other to a hub where all the other machines are. The NT4.0 router has an outside address ( 64.190.x.x ) assigned to the network card plugged into the DSL line and it works good. I can surf the web, etc. The second network card on the NT4.0 box has a 192.168.1.1 address. The workstations have 192.168.1.x addresses and they can ping the 192.168.1.1 address, ( which is set as their gateway) They can not however surf the web, or traceroute to the internet. It apears that the NT4.0 box is not routing even though it is setup with IP routing. Does anyone have any ideas on what to check?

Dave

 

[outonalimb]

It's probably to do with NAT. As far as i'm aware, to do what you're asking with an NT server, each PC on your network must have a valid 'real world' IP address.

Your clients are using a private Class C address scheme that will not route to the outside world without a NAT router - which NT4 isn't.

An easy way of achieving your aim is to buy a cheap 'all-in-one' firewall/router from Netgear/Belkin/D-Link, etc. This box would plug into your DSL modem and then your network switch - giving all clients access to the internet with natted firewall protection. This is far safer than giving each client a real world IP address.

The following link should help you further:

http://www.netgear.com/products/routers/websafefirewall.php

 

[dpeno]

I am well aware of how a "real" router works and how to setup one. However this setup did work before. The old admin left after tearing down the room and before it could be setup again. The problem I am having is the client does not want to spend any money. I know $100, at most, is not much but that is what they want. I was really looking for help with the routing setup inside the NT box if anyone has any help with that problem.

Dave

 

[outonalimb]

Do you have some kind of proxy server software installed on your NT server that you are unaware of? I just can't understand how the configuration would work when NT doesn't support NAT or Internet Connection Sharing.

Interesting thread which tends to overlap with your problem:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=655698

 

[NortonES2]

the 192.168.1.1 network card needs 64.190.x.x as it's default gateway and the 64.190.x.x card needs 192.168.1.1 as it's gateway.

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If it doesn't leak oil it must be empty!!

 

[outonalimb]

Dpeno,

If you manage to get things working, could you let me know how via this thread.

Are you sure that NT4 was the internet gateway router prior to your administrator leaving? Any Microsoft OS released after 1998 can be an Internet IP router - i.e. using ICS or NAT in 2K/2K3. I'm sure that NT4 can't natively do this.

Regards,

 

[MTVW]

IP forwarding could be disabled.....check this in your TCP/IP network properties page...

 

[outonalimb]

Another interesting and potentially useful link:

http://www.windowsnetworking.com/articles_tutorials/winradsl.html