Enabling built-in LAN prevents access to wireless Internet...

[BehindEnemyLines]

I am sharing a cable Internet conneciton with my good neighbor next door for awhile (legal? probably not). We split the cost of the hardware and monthly payment. The network is secured with WPA2 so that only me and him know the complex key.

The problem is the Linksys wireless router is located at my neighbor's home, and I also have my own Netgear router for my LAN (printer/file sharing). I connect to his wireless Internet via a USB wifi adapter, and it works quite well. But if I enable my LAN, then the Internet no longer works. I think the Internet programs try to access the Internet through my router rather than the USB wifi and times-out when it can't find an Internet connection. The print/file sharing works fine though. Is there a way to have access to the Internet AND my home LAN concurrently. It's rather inconvenient to disable the built-in ethernet everytime I need to use the Internet. I also don't want my neighbor access to my shares either.

 

[JackMDS]

You computer sits on two Networks and thus get confused you need to use Windows ICS to Route between the two Networks.

Your USB Wireless card is the Host, the NIC should be the client.

http://www.practicallynetworked.com/sharing/xp_ics

 

[BehindEnemyLines]

That ICS allows me to connect to the Internet with both adapters enabled, but I now can't access my LAN shares. The PC refuses to access my file server saying that the location could not be found. If I allow my router to automatically assign the IP addresses, then I can access the shares but not the Internet. It seems that I still can't have both functional concurrently.

The ICS procedure automatically changes my built-in ethernet adapter to:
(Both adapters enabled, Internet works, but shares are NOT accessible.)
IP address: 192.168.0.1
Subnet mask: 255.255.255.0

My home Netgear router was originally set to assign the built-in ethernet an ip address:
(If built-in ethernet is enabled, Internet does NOT work, but shares are accessible.)
IP address: 10.0.0.X
Subnet mask: 250.0.0.0
Default gateway: 10.0.0.1

The USB wifi has the following settings:
IP address: 192.168.1.101
Subnet mask: 255.255.255.0
Default gateway: 192.168.1.1

The reason why I had two different subnets was because I wanted to place the neighbor's settings in the Internet Zone in my ZoneAlarm so that the my shares wouldn't be visible on his computer. I have my LAN in the Trusted Zone so that I can share files/printer.

 

[LOFBenson]

Everything else in your house needs to be in the 192.168.1.x network with subnet 255.255.255.0 and gateware 192.168.1.1. You could turn off DHCP on your netgear and let ICS do the DHCP or you can do it manually on each system.