Sangfor Technologies Company Limited

Sangfor Technologies Inc.

Jingbo Liang

Zhiliang Zhang

A communication method includes automatically sending a DHCP discovery request to a DHCP server after power on; receiving network configuration parameters assigned by the DHCP server responding to the DHCP discovery request; and sending a predefined domain name query request for a predefined domain name according to a network address of a DNS server included in the network configuration parameters. The domain name query request passes through a wireless controller. The method also includes, after the wireless controller intercepts the predefined domain name query request by monitoring domain name query requests passing through the wireless controller, receiving a simulated domain name query reply packet from the wireless controller responding to the predefined domain name query, wherein the domain name query reply packet includes a predefined network address corresponding to the predefined domain name; and communicating with the wireless controller according to the predefined network address.

Communication method, wireless access point, wireless controller and communication system

A method for detecting proxy internet access includes intercepting an access request from a proxied terminal of a same internet account; and sending a redirection packet to the proxied terminal sending the access request. The redirection packet carries a first timestamp indicating when the redirection packet is sent. The method also includes receiving a reported timestamp difference between the first timestamp and a second timestamp. The second timestamp is a system time of the proxied terminal acquired after the proxied terminal receives the redirection packet. Further, the method includes executing a clustering process on the reported timestamp difference to obtain a clustering result; and based on the clustering result, detecting whether the same internet account is a proxy account.

Growing community of inventors

Shenzhen, China

Jingbo Liang