I just got and configured a Cisco 831 router. The IOS is 12.4. The router is connected to a DSL modem and goes to internet. The problem is, from PC in my LAN, only some web sites can be accessed, like google.com. Some web sites cannot be opened, like weather.com. I tried trace route, the routing goes to the 831 router (the only gateway). I telnet to 80 port of those web sites, and it works.
So I really got no idea what could be wrong. Can you please advise? I attached my running-config.
ANY suggestion will be greatly appreciated!!!