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2 network cards confusing routing?

Microsoft Windows xp professional w/serv...
July 7, 2010 at 15:24:51
Specs: Windows xp pro sp3
Hello. I have a computer with 2 network cards. The first card connects to a PLC for process network. Its IP is (manually configured static). The second card connects to a mail server. Its IP address is (manually configured, complete with DNS server entries). Problem is, i cannot ping the mail server until I disable the first network card. As soon as I reenable it, I can no longer ping the mail server. Its as if the computer does not know which card to navigate to. Is there a way to set this up to work better? Some sort of routing setup I can do? Thanx in advance

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July 7, 2010 at 15:38:35
You need to setup your local routing tables to specify which card the traffic should go through. You use the built in ROUTE command in the command prompt.

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July 7, 2010 at 15:40:53
tIP is

Should that be miss-type that should be is a public IP address belonging to Canadian Forest Products Ltd. Seems a strange IP to be connecting to a PLC


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July 7, 2010 at 15:50:40
The IP address is correct. The computer has 2 cards. This card connects to the Canfor network for VPN access for remote programming and sending out alarm messages thru their email server. The second card connects directly to the PLC. This computer runs a touchscreen for operating a plant. 2 cards are required to "seperate" the 2 networks. (ie: we cant put the PLC directly on their corporate network for security reasons).

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