ent The mobility extension can also include the following options: - Mobile Node Identifier: this option contains the identity of the mobile node that the MAG function retrieved during the authentication of the mobile node; - Home Network Prefix: this option contains the IPv6 prefix assigned to the mobile node by the LMA function; - Handoff Indicator: this option indicates that there has been a change of MAG. This option is also used to refresh the BCE table; - Access Technology Type: this option provides the type of access network to which the mobile node is connected; - Timestamp: this option provides a timestamp calculated in the number of seconds elapsed since 1 January 1970; - Mobile Node Link-layer Identifier: this option contains the MAC (Medium Access Control) address of the mobile node; - Link-local Address: this option contains the proxy-CoA of the MAG function for the PBU extension or the LMAA of the LMA function for the PBA extension. 8.1.2. Procedures 8.1.2.1. Mobile node attachment to the LMA function At the end of the connection phase on the local network, the mobile node transmits the ICMPv6 message Router Solicitation in order to retrieve its IPv6 address configuration (Figure 8.2). Mobile 1 - Router Solicitation 2 - Proxy Binding Update 3 - Proxy Binding Acknowledgment DHCPV6 request DHCPV6 request 4 - Router Advertisement Relay DHCPv6 response DHCPV6 response DHCPv6 server Figure 8.2. Mobile node attachment to the LMA function IPv6 configuration 150 Wi-Fi Integration to the 4G Mobile Network Upon receipt of this message, the MAG function transmits the PBU extension to the LMA function. This extension contains the identity (MN-ID) of the mobile node and the proxy-CoA for tunnel mounting. The LMA function records in its BCE base the identity (MN-ID) of the mobile node and the proxy-CoA IP of the MAG function. The LMA function responds to the MAG function with the PBA extension containing the LMAA for tunnel mounting and the HNP for configuring the IPv6 address of the mobile. The PBU and PBA exten