First, thanks a lot my friend, I also don't like limits.
Any web sites opened will show an error. e.g http://www.google.com. Then comes this picture.
However, if I changed the address into http://203.208.46.180 which is one of google web server IP addresses, the web page can be correctly opened. The same situation can be found on any other websites.I use ADSL, PPTP and a modem to connect internet. I tried use a route and directly modem both, but it doesn't work.At your convenient, please could you help me? Thank you again.