Mobile IP Mobile Agent Performance Considerations

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Mobile IP - Mobile Agent Performance
Considerations

• CSE5346-SU04
• Nicandro G. Alanis

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• Mobile Ip Overview
• Mobile Agents
• Applications of MAs
• Designing MAs

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• Mobile IP Nomencalture
• MN Mobile Node
• HA Home Agent
• FA Foreign Agent
• COA Care Of Address
• CN Corresponding Node

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• Mobile IP Process
• Agent Discovery
• Mobility Agents advertises presence periodically
  message with COA, HA FA
• MN observes message to confirm HN or FN
• Registration
• If in new network, registers w/Perm.IP, HA IP
• FA registers with HA, HA registers COA of MN

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• Mobile IP Registration Process

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• Mobile IP Process
• In Service
• If node wants to send to MN, sends to Perm IP
• HA receives packet, forwards to COA constructs
  IP-within-IP packet (tunneling)
• FA decapsulates send to MN in its network

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• Mobile IP Process
• In Service

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• Mobile Agents
• Mobile agents is software, which can physically
  travel from one network to another. Provided that
  the machines provide agent hosting capability.
• Mobile agent are designed to perform tasks on
  behalf of the Mobile Node.
• Dissimilar to distributed computing as code
  allowed to travel and interact with hosts,
  services or other agents

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• Mobile Agent
• Needs For Migration Across Network
• Common Execution Language/Environment
• Process Persistence
• Communication between agent hosts
• Security

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• Common Execution Language/Environment
• To migrate from host to host, common execution
  language must be available.
• Process Persistence
• Ability to persist (save state of) exexution (ie
  save variables, point of execution etc) prior to
  moving to new host ability to stop restart
  from last POE
• Must be supplied in Language/Environment need
  not burden application

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• Communication Between Agent Hosts
• Agent will use existing common mechanism to
  travel between hosts (ie TCP/IP, RMI, HTTP).
• Security
• Hosts must protect themselves against malicious
  or poorly written agents
• Agents must be able to protect themselves from
  hosts which may dissect or modify them

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• Application of Mobile Agents
• Help conserve bandwidth help improve queries,
  less information sent over web if queried
  directly at source
• Perform Tasks when not connected Mobile Node
  could offload tasks to host, return/pickup
  results (mobile/distributed execution)
• Information Retrieval find best price on X
  product, find news, monitor stock etc Not need
  be connected

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• Developing MAs
• RMI - Javas remote method invocation allows
  writing of distributed systems which can help MAs
  mobility
• CORBA Common Object Request Broker
  Architecture, language platform independent
  method invocation and data description.

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• Developing MAs
• Common Languages/Packages
• Telescript
• Java
• Aglets (Agent Applets)
• Grasshopper
• Tryllian

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• References
• Mobile IP Debalina Ghosh http//www.acm.org/cros
  sroads/xrds7-2/mobileip.html
• David Reilly - Mobile Agents Process Migration
  and its Implications http//www.davidreilly.com/to
  pics/software_agents/mobile_agents
• D.B. Lange, M. Oshima Seven Good reasons for
  Mobile Agents Communications of the ACM
  42388-89 March 1999