An alternative method for connecting host C in Exercise 67 is to use proxy ARP and routing: B agrees to route traffic to and from C, and also answers ARP queries for C received over the Ethernet.

(a) Give all packets sent, with physical addresses, as A uses ARP to locate and then send one packet to C.

(b) Give B’s routing table. What peculiarity must it contain?

Exercise 67)

Suppose hosts A and B are on an Ethernet LAN with IP network address 200.0.0/24. It is desired to attach a host C to the network via a direct connection to B (see Figure 3.60). Explain how to do this with subnets; give sample subnet assignments. Assume that an additional network prefix is not available. What does this do to the size of the Ethernet LAN?

Figure 3.60)

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A B