In the case of dial-up access of USG2130, QQ works but the web page can’t be opened. Ping Baidu、Xinlang, it works normally. The configurations are dial-up, NAT and DHCP.
Change the Vlanif interface of the inside network interface as 1480, the problem is solved and all the visits work.
The MTU of the dial-up interface is 1492, the MTU of the inside network interface is 1500.
It exist the wrong message in the interface.