Suppose the correspondent in Figure 6.22 were mobile. Sketch the additional network-layer infrastructure that would be needed to route the datagram from the original mobile user to the (now mobile) correspondent. Show the structure of the datagram(s) between the original mobile user and the (now mobile) correspondent, as in Figure 6.23.

Figure 6.22 €¢ Initial elements of a mobile network architecture

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Home network: 128.119.40/24 Visited network: 79.129.13/24 Mobile node Permanent address: 128.119.40.186 Permanent address: 128.119.40.186 Care-of address: 79.129.13.2 Home agent Foreign agent Wide area network Correspondent