Dynamic network allocation for mobile router

• US 6,959,341 B1
• Filed: 12/20/2000
• Issued: 10/25/2005
• Est. Priority Date: 12/20/2000
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Leung, Kent K.
• Primary Examiner(s): Gaffin, Jeffrey
• Assistant Examiner(s): MARTINEZ, DAVID E
• Application Number:
  US09/746,409
• Time in Patent Office: 1,770 Days
• Field of Search: 709/250, 370/328, 370/331, 455/422.1, 455/435.1, 455436-439, 455/432.1, 455/433
• US Class Current: 709/250
• CPC Class Codes: H04W 80/04 Network layer protocols, e.g. mobile IP [Internet Protocol]
• CPC Class Codes: H04W 84/005 Moving wireless networks

Abstract

Methods and apparatus for implementing a Home Agent supporting Mobile IP and being capable of allocating one or more networks to a mobile router which registers with the Home Agent comprise receiving a registration request packet from the mobile router, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from the Home Agent. The one or more networks are allocated to the mobile router corresponding to the network allocation extension of the registration request packet. A registration reply packet including a network allocation extension identifying the one or more networks allocated to the mobile router is then sent to the mobile router.

Claims

1. A mobile router supporting Mobile IP and being capable of requesting one or more networks during registration with a Home Agent, the mobile router comprising:

a processor; and

a memory, at least one of the processor and the memory being adapted for;

composing a registration request packet, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

sending the registration request packet to the Home Agent; and

receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent;

wherein the network allocation extension indicates a number of subnets being requested by the mobile router.

2. A mobile router supporting Mobile IP and being capable of requesting one or more networks during registration with a Home Agent, the mobile router comprising:

a processor; and

a memory, at least one of the processor and the memory being adapted for;

composing a registration request packet, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

sending the registration request packet to the Home Agent; and

receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent;

wherein the network allocation extension indicates a size of the one or more networks being requested by the mobile router from the Home Agent.

3. A mobile router supporting Mobile IP and being capable of requesting one or more networks during registration with a Home Agent, the mobile router comprising:

a processor; and

a memory, at least one of the processor and the memory being adapted for;

composing a registration request packet, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

sending the registration request packet to the Home Agent; and

receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent;

wherein at least one of the processor and the memory are further adapted for;

detecting a Foreign Agent prior to composing and sending the registration request packet to the Home Agent.

4. A mobile router supporting Mobile IP and being capable of requesting one or more networks during registration with a Home Agent, the mobile router comprising:

a processor; and

a memory, at least one of the processor and the memory being adapted for;

composing a registration request packet, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

sending the registration request packet to the Home Agent; and

receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent;

selecting from the one or more networks allocated to the mobile router by the Home Agent an IP address; and

configuring an interface of the mobile router with the IP address such that a network coupled to the interface is identified by the IP address;

wherein at least one of the processor and the memory are further adapted for;

deconfiguring the interface of the mobile router such that the interface is not identified by the IP address.

5. The mobile router as recited in claim 4, wherein deconfiguring the interface is performed when a lifetime of the mobile router has expired.

6. The mobile router as recited in claim 4, wherein at least one of the processor and the memory are further adapted for:

sending a deregistration request to the Home Agent prior to deconfiguring the interface of the mobile router.

7. A mobile router supporting Mobile IP and being capable of requesting one or more networks during registration with a Home Agent, the mobile router comprising:

a processor; and

a memory, at least one of the processor and the memory being adapted for;

composing a registration request packet, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

sending the registration request packet to the Home Agent; and

receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent;

wherein at least one of the processor and the memory are further adapted for;

adding the one or more networks identified in the network allocation extension to a private DHCP pool available to the mobile router.

8. The mobile router as recited in claim 7, wherein at least one of the processor and the memory are further adapted for:

removing the one or more networks from the private DHCP pool available to the mobile router.

9. The mobile router as recited in claim 8, wherein removing the one or more networks from the private DHCP pool available to the mobile router is performed when a lifetime of the mobile router has expired.

10. The mobile router as recited in claim 8, wherein at least one of the processor and the memory are further adapted for:

sending a deregistration request to the Home Agent prior to removing the one or more networks from the private DHCP pool available to the mobile router.

11. The mobile router as recited in claim 7, wherein at least one of the processor and the memory are further adapted for:

updating a registration table to indicate a lifetime granted during registration of the mobile router with the Home Agent.

12. The mobile router as recited in claim 11, wherein at least one of the processor and the memory are further adapted for:

deleting an entry from the registration table when the lifetime has expired.

13. In a mobile router supporting Mobile IP, a method of requesting one or more networks during registration with a Home Agent comprising:

composing a registration request packet the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

sending the registration request packet to the Home Agent; and

receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent;

wherein the network allocation extension indicates a number of subnets being requested by the mobile router.

14. In a mobile router supporting Mobile IP, a method of requesting one or more networks during registration with a Home Agent, comprising:

composing a registration request packet, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

sending the registration request packet to the Home Agent; and

receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent;

wherein the network allocation extension indicates a size of the one or more networks being requested by the mobile router from the Home Agent.

15. In a mobile router supporting Mobile IP, a method of requesting one or more networks during registration with a Home Agent, comprising:

composing a registration request packet, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

sending the registration request packet to the Home Agent;

receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent; and

detecting a Foreign Agent prior to composing and sending the registration request packet to the Home Agent.

16. In a mobile router supporting Mobile IP, a method of requesting one or more networks during registration with a Home Agent, comprising:

composing a registration request packet, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

sending the registration request packet to the Home Agent; and

receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent;

selecting from the one or more networks allocated to the mobile router by the Home Agent an IP address;

configuring an interface of the mobile router with the IP address such that a network coupled to the interface is identified by the IP address; and

deconfiguring the interface of the mobile router such that the interface is not identified by the IP address.

17. The method as recited in claim 16, wherein deconfiguring the interface is performed when a lifetime of the mobile router has expired.

18. The method as recited in claim 16, further comprising:

sending a deregistration request to the Home Agent prior to deconfiguring the interface of the mobile router.

19. In a mobile router supporting Mobile IP, a method of requesting one or more networks during registration with a Home Agent, comprising:

composing a registration request packet, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

sending the registration request packet to the Home Agent;

receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent;

adding the one or more networks identified in the network allocation extension to a private DHCP pool available to the mobile router.

20. The method as recited in claim 19, further comprising:

removing the one or more networks from the private DHCP pool available to the mobile router.

21. The method as recited in claim 20, wherein removing the one or more networks from the private DHCP pool available to the mobile router is performed when a lifetime of the mobile router has expired.

22. The method as recited in claim 20, further comprising:

sending a deregistration request to the Home Agent prior to removing the one or more networks from the private DHCP pool available to the mobile router.

23. The method as recited in claim 19, further comprising:

updating a registration table to indicate a lifetime granted during registration of the mobile router with the Home Agent.

24. The method as recited in claim 23, further comprising:

deleting an entry from the registration table when the lifetime has expired.

25. A computer-readable medium storing thereon computer-readable instructions for requesting one or more networks during registration with a Home Agent in a mobile router supporting Mobile IP, comprising:

instructions for composing a registration request packet, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

instructions for sending the registration request packet to the Home Agent; and

instructions for receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent;

wherein the network allocation extension indicates a number of subnets being requested by the mobile router.

26. A computer-readable medium storing thereon computer-readable instructions for requesting one or more networks during registration with a Home Agent in a mobile router supporting Mobile IP, comprising:

instructions for composing a registration request packet, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

instructions for sending the registration request packet to the Home Agent; and

instructions for receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent;

wherein the network allocation extension indicates a size of the one or more networks being requested by the mobile router from the Home Agent.

27. A computer-readable medium storing thereon computer-readable instructions for requesting one or more networks during registration with a Home Agent in a mobile router supporting Mobile IP, comprising:

instructions for composing a registration request packet, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

instructions for sending the registration request packet to the Home Agent; and

instructions for receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent;

wherein at least one of the processor and the memory are further adapted for;

detecting a Foreign Agent prior to composing and sending the registration request packet to the Home Agent.

28. A computer-readable medium storing thereon computer-readable instructions for requesting one or more networks during registration with a Home Agent in a mobile router supporting Mobile IP, comprising:

instructions for composing a registration request packet, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

instructions for sending the registration request packet to the Home Agent;

instructions for receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent;

instructions for selecting from one or more networks allocated to the mobile router by the Home Agent an IP address;

instructions for configuring an interface of the mobile router with the IP address such that a network coupled to the interface is identified by the IP address; and

instructions for deconfiguring the interface of the mobile router such that the interface is not identified by the IP address.

29. The computer-readable medium method as recited in claim 28, wherein deconfiguring the interface is performed when a lifetime of the mobile router has expired.

30. The computer-readable medium method as recited in claim 28, further comprising:

sending a deregistration request to the Home Agent prior to deconfiguring the interface of the mobile router.

31. A computer-readable medium storing thereon computer-readable instructions for requesting one or more networks during registration with a Home Agent in a mobile router supporting Mobile IP, comprising:

instructions for composing a registration request packet, the registration request packet including a network allocation extension indicating one or more networks being requested by the mobile router from a Home Agent;

instructions for sending the registration request packet to the Home Agent;

instructions for receiving a registration reply packet from the Home Agent, the registration reply including a network allocation extension identifying one or more networks allocated to the mobile router by the Home Agent; and

instructions for adding the one or more networks identified in the network allocation extension to a private DHCP pool available to the mobile router.

32. The computer-readable medium as recited in claim 31, further comprising:

removing the one or more networks from the private DHCP pool available to the mobile router.

33. The computer-readable medium as recited in claim 32, wherein removing the one or more networks from the private DHCP pool available to the mobile router is performed when a lifetime of the mobile router has expired.

34. The computer-readable medium as recited in claim 32, further comprising:

sending a deregistration request to the Home Agent prior to removing the one or more networks from the private DHCP pool available to the mobile router.

35. The computer-readable medium as recited in claim 31, further comprising:

updating a registration table to indicate a lifetime granted during registration of the mobile router with the Home Agent.

36. The computer-readable medium as recited in claim 35, further comprising:

deleting an entry from the registration table when the lifetime has expired.