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Browse Prior Art Database

MIP HOME AGENT AVAILABILITY UPDATING

IP.com Disclosure Number: IPCOM000009310D
Original Publication Date: 1999-Jun-01
Included in the Prior Art Database: 2002-Aug-15
Document File: 2 page(s) / 150K

Publishing Venue

Motorola

Related People

Michelle Afenya: AUTHOR

Abstract

A Home Agent back-up scheme is proposed to reduce the recovery time in the event of an HA fail- ure. A new entity, the Alternate HA is required that is simply an existing HA that has the ability to regis- ter Mobile Nodes. The scheme does not attempt to address security concerns from the addition of the Alternate HA.

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MOTOROLA Technical Developments

   MIP HOME AGENT AVAILABILITY UPDATING

by Michelle Afenya

overhead of additional registration messages. If the MN has already completed the registration process, it will never know that its home agent is no longer forwarding datagrams to it until the lifetime of its mobility binding expires or until it generates a con- nection oriented interaction with another node in the intemet. This could be a prolonged period of time and vital information could be lost because of this.

SOLUTION

  A new Mobile IP option will be added to the Agent Advertisement and Registration Request/Reply messages. This option will allow the MN to receive information about a new Home Agent in the event that the HA that the MN had reg- istered with is no longer responding to the network or to mobile node interactions. The information from the new HA would be relayed to the MN in a reasonable amount of time (system configurable -based on the length of time between Agent Advertisements). The receipt of an Agent Advertisement from the MN's home network to the MN would trigger a new registration request to be sent to the new home agent. It resolves the problem by making another HA, besides the HA that the MN has registered with, on the MN's location in a for- eign network. If the Alternate HA is aware that the MN's HA is no longer available, it doubly encapsu- lates the Agent Advertisements and tunnels the mes- sage to the mobile node. The MN will be aware of the loss of its HA much sooner than if it waited for its registration lifetime to expire. The loss of data and the high delays are greatly reduced if the MN's HA is replaced as quickly as possible.

  The MN will be able to get information about other available HAS on its home network in the event that the HA that it has registered with is no longer capable of forwarding datagrams to mobile nodes. This will occur once it is determined that the MN's HA is down and will not have to wait until the MN attempts to renew its registration.

0 MOtomla, Inc. ,999 189 June 1999

ABSTRACT

  A Home Agent back-up scheme is proposed to reduce the recovery time in the event of an HA fail- ure. A new entity, the Alternate HA is required that is simply an existing HA that has the ability to regis- ter Mobile Nodes. The scheme does not attempt to address security concerns from the addition of the Alternate HA.

BACKGROUND

  Nodes in the internet are assigned addresses based on network location. That is, different por- tions of the IP address arc used to locate a network, the subnet, and finally the node itself. The need for node mobility has increased with the wide spread use of laptops and wireless technology. Nodes can- not become mobile when using this IP addressing scheme without the assignment of a new address. The assignment of a new address is normally accomplished by protocols like, Dynamic Host Configuration Protocols (DHCP) [l] or by the man- ual assignment of nodes by network administrators. Howeve...