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Supporting mobile hosts on an internet protocol network

  • US 7,650,424 B2
  • Filed: 04/03/2001
  • Issued: 01/19/2010
  • Est. Priority Date: 04/04/2000
  • Status: Expired due to Fees
First Claim
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1. A method of supporting a mobile host on an information network configured for multicast routing, comprising:

  • defining a subnet (U1) of the network that includes one or more mobile hosts and a first interface of a home router in the network, and identifying the first interface and the mobile hosts with corresponding unicast network addresses (U1.x);

    identifying a second interface of the home router with a corresponding unicast network address (U2.x);

    assigning the first interface of the home router and the mobile hosts corresponding group addresses (Mx) according to a defined relation with respect to said unicast network addresses;

    mapping, at the second interface of the home router, unicast addresses of packets received at the second interface and destined to members of the subnet (U1), to the group addresses (Mx) assigned to the members of the subnet;

    linking the mobile hosts with the network at corresponding points of attachment; and

    sending a request from a given mobile host to join a group corresponding to a group address assigned to the given mobile host each time the mobile host links with the network at a new point of attachment, thereby enabling routers in the network to track the mobile host as it moves its link with the network from one point of attachment to another, and to route unicast packets originating from a host outside the subnet and destined to a given mobile host, by way of a virtual link defined between the home router and the given mobile host.

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