Embodiments of the present invention provide an information providing method, a home gateway, and a home network system. The method includes: obtaining an IPv6 address or an IPv6 prefix of a client and a service type of the client; establishing a mapping between the IPv6 address or the IPv6 prefix of the client and the service type of the client; sending the mapping between the IPv6 address or the IPv6 prefix of the client and the service type of the client to a Broadband Remote Access Server (BRAS), so that the BRAS dispatches and manages a service of the client according to the mapping between the IPv6 address or the IPv6 prefix of the client and the service type of the client.