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Comcast allows the home user to buy a second IP address. I bought a Cisco switch (I don't know whether it's Layer 2 or Layer 3) based on some advice I got. One port of the switch is connected to my router, which in turn serves my LAN, and another port is connected to a standalone computer. A third port is connected to my modem. I confirmed that both the router and the standalone computer get different external-facing IP addresses.
This setup has worked for me for months. However, I recently got a speed upgrade from Comcast and now only one node in the switch works at a time. They're sending a technician out to "disable a trap."
My question is, how is this setup able to work in the first place?
When you say "router," do you mean my modem? The standalone computer isn't connected to the router, it's connected to the switch. This sounds like you thought I said something like "I have a router behind a modem and my computers connected to my LAN aren't getting internal IP addresses," which is not at all my issue. – user25366 – 2013-11-07T21:09:03.977