Patent ID: 8213369
Filing Date: 2012-07-03
Classification: H04L,H04W

Abstract:
1. A method for obtaining home agent information of a mobile node (MN), comprising: receiving, by a DHCPv6 server, a DHCPv6-based request message carrying a demand for home agent information from the MN when the MN is started up; obtaining, by the DHCPv6 server, the home agent information of the MN stored in the DHCPv6 server according to the received DHCPv6-based request message; and carrying, by the DHCPv6 server, the home agent information in a DHCPv6-based response message and sending the response message to the MN; wherein the demand for home agent information from the MN is carried in an extended option of the request message, in which the extended option is named as OPTION_MOBILITY and added to a format of the request message; and the extended option comprises an option-code field, an option-len field and an option-data field, in which the content in the option-code field of the request message indicates that the demand for home agent information from the MN is included in the extended option, and the content in the option-len field and option-data field indicates that the MN resides in a home or a foreign link; when the request message indicates that the MN intends to obtain the MN's home agent information and that the MN resides in the home link, the content in the option-code field is a first preset value, the content in the option-len is a second preset value, and the content in the option-data is a third preset value; and when the request message indicates that the MN intends to obtain the MN's home agent information and that the MN resides in the foreign link, the content in the option-code field is the first preset value, the content in the option-len field is a forth preset value, and the content in the option-data field specifies a home address information of the MN.