A method for triggering user terminal online via data message

The invention provides a method of triggering user terminal to connect to network y data message, containing the following steps: A). access equipment receives data message sent by user terminal and enquires if there is user terminal IP address carried by the data message existing in kernel route table: if no, execute the next step and otherwise exit the flow; B). the access equipment triggers the user terminal to connect to network, where for the user terminal to whom the access equipment dynamically configures IP address, the access equipment replaces the user terminal through the DHCP protocol to apply to DHCP server for the bond IP address: if this succeeds, the access equipment connects the user terminal to the Internet and otherwise exit the flow; for the user terminal to whom the access equipment statically configures IP address, the access equipment directly connects the user terminal to the Internet. It can realize the user terminal can automatically be triggered to connect to the Internet as accessing the Internet again after abnormally off-line, and simultaneously, make the static user can be triggered to connect to the Internet only when accessing the Internet.