it sounds like you have 2 ISP's, in which case you need to just take the faster of the two
if you have a in-house/in-office LAN + your internet and want to connect to the web + have the LAN
you need to get a router, and feed it into the switch or hub that your using for the office so it can provide the internet to everybody/thing
configuration of 2 LAN's on a single PC is possible
if you have 2 NIC's
I have two LAN connections from two different service providers, and obviously with different conncetivity settings. The PC is currently having one ethernet connector. How can I configure my PC to run both LANs at the same time but with different settings?