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Multihomed 2000 workstation must force internet thru nic 1

Posted on 2008-06-14
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Last Modified: 2010-04-13
I have a 2000 workstation that must use NIC 1 for the internet and have machines on that network still be able to access the machine. From NIC 2 other machines must be able to access the machine but must not use the internet because of ports that must be open on the router I cannot do from NIC2's internet. I also need to make sure that no traffic from nic 1 can go to nic 2.

NIC 1 = 192.168.1.7 255.255.255.0 internet
NIC 2 = 172.70.70.106 255.255.0.0 LAN
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Question by:poohberry
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fhmc earned 250 total points
ID: 21786134
make sure routing is disabled on your 2000 box.  generally speaking, I don't think you'll have to worry about any hosts on your LAN accessing the Internet through your multihomed host though.

how many internal subnets do you have?  if only 1,  setting the defualt gateway on the multihomed device to use NIC1's gateway should do the trick.

if NIC2 needs to access multiple internal subnets, you will need to define custom route paths to accommodate them.

e.g.

route add 172.21.0.0 mask 255.255.0.0  "IP of the gateway on 172.70.0.0 network"
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by:fhmc
ID: 21786163
side note:

This may or may not be pertinent, but....
so far as I know the private IP class B range is restricted to 172.16.0.0  -  172.31.255.255

oddly, I checked arin.net and didn't find any entries for 172.70.0.0 or 172.70.70.0.  scratching my head... hehehe
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