I think Lurkist is correct. Check your DNS settings. If you have internal connectivity, but not can not resolve any named resources outside your firewall, usually one of the following is wrong: DNS, Subnet Mask, default gateway. Your gateway and subnet mask look standard.
DNS is what you need to check. Make sure you don't have an out-of-date static DNS set on the A1200. Or better yet, set up a new static DNS search order based on what your PC pulls down via DHCP.
