I don't see any DNS address in your config file, so that might be why you can't get anywhere. Try to ping 126.96.36.199
If you get a ping response from 188.8.131.52, it means your internet is fine, but you don't have the DNS setup to translate URLs to IPs.
It's a CHT router, so you can either try to log on to the router to see if any setting is wrong, or just called CHT and get them to fix it.
Using direct LAN connection or Wifi if it is working, to connect to your router, and try to login to your router by pointing your browser to http://192.168.1.1
Depending on which region you live in, try these passwords