Patent ID: 8787200

Claim:
A home gateway, comprising: an application terminal identifier information processing module configured to receive a first Dynamic Host Configuration Protocol (DHCP) message sent by an application terminal to the home gateway; an automatic configuration server (ACS) address information obtaining module configured to: determine whether the first DHCP message sent by the application terminal to the home gateway includes identifier information of the application terminal and a preset character string; send a second DHCP message including the identifier information and the preset character string to a DHCP server on a public network; and receive a third DHCP message including address information of an ACS of the application terminal from the DHCP server, wherein the DHCP server is configured to use the preset character string to determine whether the identifier information of the application terminal is pre-saved in the DHCP server and find the address information of the ACS of the application terminal according to the identifier information of the application terminal when the identifier information of the application terminal is pre-saved in the DHCP server; and an ACS address information sending module configured to send the address information of the ACS obtained by the ACS address information obtaining module to the application terminal.