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TCP/IP Guide by Charles M. Kozierok

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Mobile IP Efficiency Issues

Having the home agent forward all datagrams to the mobile node wherever it may be is a convenient solution to mobility, but it's also a rather inefficient one. Since the device must send every datagram first to the home network and then forward it to the mobile node, the datagrams are going to travel over some part of the internetwork twice. The degree of inefficiency represented by forwarding can be significant and may lead to problems with certain applications.

To see what the problem is, let's consider a traveling mobile Node M and a regular device that wants to send to it, Device A. The degree of the inefficiency of Mobile IP is a function of the internetwork distance between Device A and Node M's home network, compared ...

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