Two way communication

Hewlett-packard / DL380 G3
January 13, 2009 at 05:26:00
Specs: Windows 2003 Server, Xeon
Hi all

I have two separate domains. In Domain B, I have set up a gateway machine that allows me to use the internet from Domain A. I can also see all the machines in Domain A.

The gateway machine is Windows 2003 Standard. It has a network card connected to the switch in Domain B and a wireless card connecting it to Domain A. The wireless card IP is, the Wireless Access Point IP is and the main server in Domain A is

Now the problem, Although there is communication from Domain B to Domain A, I cannot communicate back. I can ping the IP of the W.A.P. but not the address that the wireless card has.

Any ideas?

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January 13, 2009 at 07:22:27
Please redescribe your problem. You don't mention from where you are trying to ping the wireless card.

Since both domains are in the same subnet you can't route between them on the box and it begs the question why setup like this if both have the same gateway entry.

So why are you doing this instead of establishing a trust between forests?

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January 14, 2009 at 01:18:13
Domain A IP range is subnet gateway
Domain B IP range subnet gateway

The reason I am doing this is because I am setting up new servers for the company in a remote building. Currently there is no network in the remote building, I have a wireless access point in the main building. The gateway machine connects to the W.A.P., which allows the remote office access to the internet and the old network.

So, from the remote building, I can access anything. From the main building I cannot access anything in the remote building. The pinging will respond from the IP of the W.A.P. but not the IP of the gateway card (pinging from main building).

My eventual goal is to set up a trust between the two domains, once two way communication is established.

This will only be a temporary fix as we are getting a fibre cable between the two buildings but I have no timescale on this and would like to get on with configuring as much as possible.

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January 15, 2009 at 08:35:52

I created a Interface in the NAT/Basic Firewall section of RRAS on the Gateway machine for the wireless card.

Then changed its properties so that it was a private interace connected to a private network.

Configured the Main firewall router to route any traffic to the Wireless IP address ( and it now communicates both ways.

Tomorrow I shall be setting up the trust between the networks.

Many thanks for your help anyway.

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January 15, 2009 at 08:36:52
P.S. How do I close a message off?

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