Avaya Configuring IP, ARP, RIP, and OSPF Services Manuel d'utilisateur télécharger pdf (Page 125)

100

101

Configuring Address Resolution

117356-E Rev 00

4-7

Enabling Proxy ARP on an Interface

Proxy ARP allows a router to answer a local ARP request for a remote destination.

For example, in Figure 4-1

, hosts B and C are located on the same network but on

separate subnetworks. Hosts B and C do not understand subnetworking. The

router connecting the two physical networks knows which host resides on which

network. The address mask is 255.255.255.000. In this example, one subnet is a

remote network with respect to the other subnet.

Figure 4-1. Proxy ARP Example

Host B wants to talk to host C, so host B broadcasts an ARP request, which asks

IP address 140.250.250.3 to respond with its physical address. The router captures

host B’s ARP request and responds with its hardware address, 00 002 00 00 01,

and host C’s IP address, 140.250.250.3. Host B maps host C’s IP address

(140.250.250.3) to the router’s hardware address (00 002 00 00 01).

140.250.250.0140.250.200.0

140.250.250.2140.250.200.2

140.250.200.1

00 002 00 00 01

140.250.200.1

00 002 00 00 01

140.250.250.3140.250.250.3

00 002 00 10 600 002 00 10 30

Router

Host

IP0011A

1 2 ... 120 121 122 123 124 125 126 127 128 129 130 ... 361 362

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Avaya Configuring IP, ARP, RIP, and OSPF Services Manuel d'utilisateur Page 125

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