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Dual network cards and redundant networks?

Posted on 1997-08-31
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Last Modified: 2013-12-23
I am trying to setup a Windows NT (workstation) machine with two network cards, both with TCP/IP stacks to communicate with two separate networks.

At the moment I can only communicate over the "first" network card in the machine. The second network card will only work if I physically remove the first network card. (If it matters, both cards are 3Com Etherlink XL's)

Is it possible to setup two network cards on Windows NT 4.0 machine so that both communicate over TCP/IP concurrently?

If so, do I need to change any registry settings to get it to work or do I need any special setup of routing/IP addresses?

Also, on a related point, is it possible to set up two network cards connected to the same network (at two different points) to provide a redundant ethernet?
In this case, if one of the network cards or cables failed is it possible to get NT to automatically switch over to the other card and continue to operate?

Thanks in advance for any information.
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Question by:omega1
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It is possible to setup NT with two NICS on two networks.
In the Network applet of control panel, under adapters select
add and simply add a second ethernet card.

You can then assign an IP address and subnet mask.

Also in the network applet you can select routing so the two
networks can communicate by enabling IP forwarding.

To have a redundant card simply do the above but use IP addresses on the same network. A multihomed system can have
two or more IPs assigned to a single NetBIOS name.

NetBIOS over IP is used for several network services such as
NetLogon etc. NetBIOS over TCP/IP binds to only one IP address per card.

During normal operation network traffic is passed to the NIC with the best apparent route to the desired network.

If you are using WINS for name resolution (highly reccommended) then add a static entry with the type multihomed into the WINS database. WINS can be tightly integrated with DNS as well.

In the event of a NIC failure then the other card will take over
responsibilities since it will be the only apparent route to the network.

Do not have NetBEUI (in case you are using it) bound to NICS
on the same network.
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