next up previous contents
Next: Mobility Agent Advertisement Extension Up: Mobile IP Previous: Overview of the Mobile   Contents

Agent Advertisement

With mobile nodes moving from net to net, where mobility agents may or may not be present some protocol, to let the MNs determine, whether a mobility agent2.12 is present, is needed. The designers of Mobile IP chose to use the existing ICMP protocol for this purpose. This is done by adding extensions to the ICMP router discovery protocol called Agent Advertisement and Agent Solicitation.

An agent advertisement is an ICMP router advertisement (see appendix D) that has been extended to carry a mobility agent advertisement extension. A mobility agent transmits agent advertisements to advertise services to visiting mobile nodes. The agent advertisement can also carry other extensions as specified by the ICMP protocol. Compared to the ''pure'' ICMP protocol the following restrictions has been imposed on the link-, IP- and ICMP header fields[23].



Subsections
next up previous contents
Next: Mobility Agent Advertisement Extension Up: Mobile IP Previous: Overview of the Mobile   Contents
root
2001-06-02