it seems you're entering the wrong IP information. I own a linksys 4 port router for quite a few years now and i'm pretty familiar the way they assign network IP addresses. I don't have a modded xbox, so I can't help ya there.
#1 your router's IP address not your PC's network address is: 192.168.0.1 or 192.168.1.1
#2 most likely your computer's LAN IP address is 192.168.1.100, you can find out what your computer's LAN IP is by doing the following Start -> Settings -> Control Panel -> Network Connections -> Local Area Connection. Then click on the Support Tab.
#3 Connect your xbox to the router in the next available port. Most likely linksys will assign the xbox the LAN IP of 192.168.1.101
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