Cable modem to single computer via Cisco switches

I have 4506 core and 3550 edge switches.  I have a cable modem in a building on the other end of campus.  I want to basically run that single connection my the cable modem to a PC that is located in another building.  I know that the cable modem comes with some external  IP.  Do I need to setup a VLAN with the external IP info or can I just get a cheap linksys router, assign it a IP, and then match my vpn with the router?
teecee33Asked:
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JFrederick29Connect With a Mentor Commented:
All you need to do is create a VLAN and add the two switchports the cable modem and the PC are plugged into, to the "cable modem vlan".  I'm assuming the cable modem provider will be sending you an IP address via DHCP so you don't need to do any addressing, if not DHCP, assign the IP address to the PC.  I'm assuming you are trunking between switches already.
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teecee33Author Commented:
I am not trunking yet.  I work at a school.  Just installed the Cisco gear and will be adding all new VLANS in June when the campus is empty.  Thanks for the advice.  I will try it this week and get back with you.
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lrmooreCommented:
You *can* get away without VLANs for a temporary measure, if you have a little linksys/dlink/soho router. Plug the router WAN port into the cable modem and let it get a public IP. Disable DHCP on the LAN port and address it with some private IP subnet that is not used on your LAN anywhere. Give that one PC an IP address on the same IP subnet, with that router as it's gateway and DNS entry. Two different IP subnets can share the same vlan, and not be able to talk to each other..
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teecee33Author Commented:
Haha.  Very cool.
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lrmooreCommented:
Again, only as a temporary measure until you get the VLAN's set up. VLAN is the "proper" way to do it. Although the two networks can't communicate on a TCP/IP layer, they still see broadcasts and NetBEUI could work to 'bridge' the two networks. Not very secure.
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teecee33Author Commented:
Worked perfect.  Thanks.
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