You'd run into problems under windows with 2 LAN cards as it'll only allow 1 to work with the socket system.
I would come out of the internet router onto a suitably sized switch (and then maybe not an el cheapo switch if you need more than 8 ports); then you'll have a LAN and an internet connexion on the same wires.
Remember to take bandwidth into account.
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Posting Virtuoso
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