Correct settings for my home network?

[newhemidude]

I recently received a letter from Comcast saying they were seeing 2 devices using the internet connection. I have a broadband cable connection and I'm using a Gigafast router(model #EE400-R). I have 2 computer hooked up to this connection. Okay--I'm assuming I have something set up wrong in the router since it's supposed to only use one external IP and Comcast is saying it's using more than one. Here is the online manual for my router:

http://www.gigafast.com/Support/Routers/EE400-R/index.htm

What setting do I need to change to only use 1 external IP?

 

[hjo3]

Hm. Does your router have NAT enabled? If it were somehow turned off, the router might act like a switch and let each PC have a different internet IP.

 

[Cheetah8799]

Check the IP addresses on your computers. If they have internal IP addresses from the router, then you have it setup right. If they have some odd IP addresses from Comcast, then maybe your router is acting as a switch. In which case your 2 computers are probably getting pounded by virus attacks and such.

By default I would figure the router is pre-configured to NOT act as a switch. That would defeat the purpose of buying the router in the first place...

If you think everything is setup right, ask Comcast to tell you the MAC addresses of the devices supposedly connected to their network. THen you can tell them if those mac addresses match up with your hardware. It could be that they have some old mac addresses in their database for some reason. Hard to say for sure though...

Also, you could check if your neighbor is leeching off your internet connection somehow...

 

[newhemidude]

Well, there aren't any settings that mention NAT. I checked the settings on the individual computers and they each showed a Comcast DNS server so I set that to the router's IP address. Both computers access the internet fine, but they don't see each other. Both computer's have file sharing enabled. One is using XP and the other W2K. What could be the problem?