By default, most (all?) linksys routers will NAT your connection for you - just grab your IP via DHCP and you're up and running.
Unless you did some serious/spurious configuring of your router, try these two things:
set your ip address to DHCP (automatic). In windows, go to the control panel | network | Local Area Network | TCP | Properties | DHCP/Automatically assign IP address.
Under Linux, make sure /etc/sysconfig/network-scripts/ifcfg-eth0 looks something like:
DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
then bounce the interface.
If you're hell-bent on running a static IP, by default, your config should approximate:
IP: 192.168.1.x (where x is a number between 2 and 254),
Subnet Mask: 255.255.255.0
Broadcast: 192.168.1.255
Network: 192.168.1.0
Gateway: 192.168.1.1 (Your router's internal address)
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