ASSISTED PROACTIVE IP ADDRESS ACQUISITION

摘要

The present invention relates to reducing the time required to provide an IP address to a mobile node by pro-actively obtaining IP addresses, through the use of PANA-assisted pro-active IP address acquisition, IKEv2-assisted proactive IP address acquisition, or by pro-active IP address acquisition us ing DHCP only. Where a DHCP is used to pre-configure an IP address in an MPA framework, a PAA generates a plurality of Session-Ids, the plurality of Ses sion-Ids is maintained as a pool of Session-Ids, a Session-Id is retrieved f rom the pool when the PAA sends a PANA-Auth-Request, and providing a pre-gen erated IP address to an MN reduces pre-authentication time. Where a IKEv2-as sisted pro-active IP address acquisition to pre-fetch IP addresses, is used to reduce the time required to provide an IP address to a MN an IP address i s obtained from a CTN as part of a standard IKEv2 procedure. A co-located DH CP relay agent is placed on the access router, or a DHCP client for obtainin g the IP address from a DHCP server in a target network using standard DHCP, a PAA pre-generates a pool of Session-Ids, the pool of Session-Ids is forwa rded directly to a Ipsec-GW. Where the time required to provide an IP addres s to a MN is reduced using only DHCP, direct DHCP communication between the mobile node and the DHCP relay or DHCP server in the CTN is enabled and the mobile node sends a unicast DHCP message to the DHCP relay agent or to the D HCP server in the CTN, requesting an address, while using the address associ ated with the current physical interface as the source address of the reques t. In this system a set of PANA Sessions-Ids have been pre-generated.