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In a method and system of establishing mobile network communications in a network such as a mobile IP network, an agent node receives a registration request message that includes routing address fields such as a home address field, a home agent address field, and a care-of address field. The regist

In a method and system of establishing mobile network communications in a network such as a mobile IP network, an agent node receives a registration request message that includes routing address fields such as a home address field, a home agent address field, and a care-of address field. The registration request further includes an extension field. The extension field of the registration request message includes at least one substitute address value. The agent node interprets the registration request message by selecting addresses from the message. When an address value in an address field is a void value, the agent node selects a substitute address value from the extension field. When an address value in the address field is not a void value, the agent node selects the address value in the address field. Using the selected addresses, the agent node establishes a mobile network session with the mobile node.

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What is claimed is: 1. A method of establishing mobile network communications, comprising: receiving at an agent node a first message requesting a mobile network session with a mobile node, the first message including a home address field, a care-of address field, and an extension field, the extens

What is claimed is: 1. A method of establishing mobile network communications, comprising: receiving at an agent node a first message requesting a mobile network session with a mobile node, the first message including a home address field, a care-of address field, and an extension field, the extension field including at least one substitute address; selecting a home address, wherein the home address is selected from the home address field if the home address field does not include a void address value and from the extension field if the home address field includes a void address value; selecting a care-of address, wherein the care-of address is selected from the care-of address field if the care-of field does not include a void address value and from the extension field if the care-of address field includes a void address value; and configuring the agent node to establish a mobile network session with the mobile node, wherein packet data addressed to the selected home address is forwarded to the selected care-of address. 2. The method of claim 1, wherein the agent node is a foreign agent node and the first message includes a home agent address field, further comprising: selecting a home agent address, wherein the home agent address is selected from the home agent address field if the home agent address field does not include a void address value and from the extension field if the home agent address field includes a void address value; and sending a second message to a home agent at the selected home agent address. 3. The method of claim 2 wherein the first message is a first registration request message and the second message is a second registration request message. 4. The method of claim 1 wherein the first message is a first registration request message. 5. The method of claim 1, wherein the agent node is a home agent node, the step of configuring the agent node including configuring the home agent node to identify packet data addressed to the selected home address and to forward the identified packet data to the selected care-of address. 6. The method of claim 1, wherein the agent node is a foreign agent node, the step of configuring the agent node including configuring the foreign agent node to send, to the mobile node, packet data that has been forwarded to the selected care-of address. 7. The method of claim 1, wherein the home address field and the care-of address fields are four-byte address fields. 8. The method of claim 7, wherein the at least one substitute address is a sixteen-byte address. 9. A method of establishing mobile network communications, comprising: receiving at an agent node a first message associated with a mobile node, the first message including a first mobile routing address field, a second mobile routing address field, and an extension field, wherein the extension field includes a first substitute address; selecting a first mobile routing address to be the first substitute address in the extension field; selecting a second mobile routing address from the first message; and configuring the agent node to establish a mobile network session with the mobile node, wherein packet data addressed to one of mobile routing addresses is forwarded to the mobile node through the other of mobile routing addresses. 10. The method of claim 9, wherein the first mobile routing address is either a care-of address or a home agent address. 11. The method of claim 9, wherein the first mobile routing address field includes a void address value. 12. The method of claim 9, wherein the extension field includes a second substitute address, and wherein the step of selecting the second mobile routing address includes selecting the second mobile routing address to be the second substitute address. 13. A method of interpreting a message, comprising: receiving a mobile Internet Protocol registration request message, the registration request message having an extension field and address fields, wherein the address fields include a home address field, a home agent field, and a care-of address field; identifying at least one of the address fields having a void address; identifying a substitute address in the extension field; and overriding the void address with the substitute address. 14. A method of interpreting a message, comprising: receiving a mobile Internet Protocol registration reply message, the registration reply message having an extension field and address fields, wherein the address fields include a home address field and a home agent field; identifying at least one of the address fields having a void address; identifying a substitute address in the extension field; and overriding the void address with the substitute address. 15. A method of operating a home agent node, comprising: receiving a message, the message including a home address field, a care-of address field, and an extension field; selecting a home address from the home address field or the extension field; selecting a care-of address from the care-of address field or the extension field; receiving packet data addressed to the selected home address; and forwarding the packet data to the selected care-of address, wherein at least one of the home address and the care-of address fields includes a void address value, and wherein at least one of the home address and the care-of address, corresponding to the address field including a void address value, is selected from the extension field. 16. The method of claim 15, wherein the step of forwarding the packet data includes tunneling the packet data to the selected care-of address. 17. The method of claim 15, wherein the message is a registration request message. 18. A method of operating a foreign agent node, comprising: receiving a first message associated with a mobile node, the first message including a home address field, a home agent address field, a care-of address field, and an extension field; selecting a home address from the home address field or the extension field; selecting a home agent address from the home agent address field or the extension field; selecting a care-of address from the care-of address field or the extension field; and sending a second message to a home agent at the selected home agent address, the second message including the selected home address and the selected care-of address; wherein at least one of the home address, the home agent address, and the care-of address fields includes a void address value, and wherein at least one of the home address, the home agent address, and the care-of address, corresponding to the address field including a void address value, is selected from the extension field. 19. The method of claim 18, further comprising receiving packet data sent by the home agent and sending the packet data to the mobile node. 20. The method of claim 18, wherein the first message is a first registration request message and the second message is a second registration request message. 21. An agent node in a network comprising: a network interface for receiving a message requesting a mobile network session with a mobile node, the first message including a home address field, a care-of address field, and an extension field, the extension field including at least one substitute address; request interpretation logic operative to select a home address, wherein the home address is selected from the home address field if the home address field does not include a void address value and from the extension field if the home address field includes a void address value; the request interpretation logic further being operative to select a care-of address, wherein the care-of address is selected from the care-of address field if the care-of field does not include a void address value and from the extension field if the care-of address field includes a void address value; and packet forwarding logic operative to provide a mobile networking session wherein packet data addressed to the to the mobile node at the selected home address is sent to the mobile node through the selected care-of address. 22. The agent node of claim 21, wherein the agent node is a home agent node, the packet forwarding logic being operative to identify packet data addressed to the selected home address and to send the identified packet data to the selected care-of address. 23. The agent node of claim 21, wherein the agent node is a foreign agent node, the packet forwarding logic being operative to receive packet data forwarded by a home agent at the selected home agent node and to send the forwarded packet data to the mobile node. 24. An agent node in a network comprising: a network interface for receiving a first registration request from a mobile node, the first registration request including a first mobile routing address field, a second mobile routing address field, and an extension field, wherein the first mobile routing address field includes a void address value, and wherein the extension field includes a first substitute address; request interpretation logic operative to select a first mobile routing address to be the first substitute address in the extension field; the request interpretation logic further being operative to select a second mobile routing address from the registration request; and packet forwarding logic operative to establish a mobile network session with the mobile node, wherein packet data addressed to one of the mobile routing addresses is forwarded to the mobile node through the other of the mobile routing addresses. 25. A system for interpreting a message, comprising: a network interface operative to receive a mobile Internet Protocol registration request message, the registration request message having an extension field and routing address fields, wherein the routing address fields include a home address field and a home agent address field; message interpretation logic operative i) to identify at least one of the routing address fields having a void address, ii) to identify a substitute address in the extension field; and iii) to override the void address with the substitute address. 26. A system for interpreting a message, comprising: a network interface operative to receive a mobile Internet Protocol registration request message, the registration request message having an extension field and at least two routing address fields; message interpretation logic operative i) to identify at least one of the routing address fields having a void address, ii) to identify a substitute address in the extension field; and iii) to override the void address with the substitute address. 27. A method of interpreting a message, comprising: receiving a mobile Internet Protocol registration request message, the registration request message having an extension field and a routing address field; identifying a substitute address in the extension field corresponding to the routing address field; and overriding an address value in the routing address field with the substitute address.