Method for ipv4 mobility from ipv6 networks
A method for allowing a Mobile IPv4 Mobile Node ( 2 ) to communicate from an IPv6 visited network ( 5 ), and across IPv6 networks, back to a Mobile IPv4 Home Agent ( 1 ), in a Mobile IPv4 Network ( 4 ), comprising a Mobile Node supporting Mobile IPv4 registration procedures including IvPv6 addressing details to support MN-HA communication; a Home Agent supporting connectivity to both IPv4 and IPv6 networks to facilitate remote access; tunneling of IPv4 traffic over IPv6 networks from the Mobile Node; and, tunneling of Mobile IPv4 traffic over IPv6 networks from the Home Agent.
1 . A method for allowing a Mobile IPv4 Mobile Node to communicate from an IPv6 visited network, and across IPv6 networks, back to a Mobile IPv4 Home Agent, in a Mobile IPv4 Network, comprising:
a Mobile Node supporting Mobile IPv4 registration procedures including IPv6 addressing details to support MN-HA communication;
a Home Agent supporting connectivity to both IPv4 and IPv6 networks to facilitate remote access;
tunneling of IPv4 traffic over IPv6 networks from the Mobile Node;
tunneling of Mobile IPv4 traffic over IPv6 networks from the Home Agent.
2 . The method of claim 1 , wherein the Mobile Node acquires an IPv6 address in the visited network.
3 . The method of claim 2 wherein the Mobile Node sends a MIPv4 Registration Request over IPv6 using the acquired IPv6 address as source address, and the Home Agent IPv6 address as destination address.
4 . The method of claim 2 , wherein the Mobile Node includes the acquired IPv6 address as an IPv6 care-of address extension in the Mobile IPv4 Registration Request.
5 . The method of claim 1 , wherein the Home Agent extracts the IPv6 care-of address from the Registration Request extension and uses it as the tunnel endpoint for the IPv4 in IPv6 tunnel back to the Mobile Node.
6 . The method of claim 1 , wherein the Mobile Node tunnels IPv4 packets in IPv6 headers, destined for the Home Agent.
7 . The method of claim 1 , wherein the Mobile Node de-capsulates IPv6 tunneled IPv4 packets from the Home Agent.
8 . The method of claim 1 , wherein the Home Agent accepts Mobile IPv4 Registration Requests arriving on an IPv6 network.
9 . The method claim 1 , wherein the Home Agent tunnels IPv4 packets in IPv6 headers, destined for the Mobile Node.
10 . The method of claim 1 , wherein the Home Agent de-capsulates IPv6 tunneled IPv4 packets from the Mobile Node.
11 . The method of claim 1 , wherein the Home Agent employs UDP tunneling from the HA to the MN in accordance with RFC 3519.