Avaya Configuring IP, ARP, RIP, and OSPF Services Manual de usuario descargar pdf (Pagina 131)

Customizing ARP and RARP Services

308627-14.00 Rev 00

4-9

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).

With Proxy ARP enabled, the router responds with an ARP reply if there is a valid

route (that is, if the router is able to forward traffic) to the destination in the

routing table. This route may be a subnet route or a default route. For the router to

respond for subnets that are reachable via the default route, you must configure IP

to use a default route for unknown subnets (see “Using a Default Route for an

Unknown Subnet” on page 3-12).

Some devices use Proxy ARP to determine a gateway rather than relying on a

statically defined default gateway. These devices use ARP for all remote

destinations. To enable the router to reply to ARP for remote destinations on other

networks, you must enable Proxy ARP and set the Nonlocal ARP Destination

parameter to Accept (see “Customizing Global ARP” on page 4-3).

By default, Proxy ARP is disabled on the interface. You can use the BCC or Site

Manager to enable Proxy ARP.

Using the BCC

To enable or disable Proxy ARP, navigate to the IP interface prompt (for example,

box; eth 2/2; ip/2.2.2.2/255.255.0.0) and enter:

proxy

<state>

state

is one of the following:

enabled

disabled

(default)

For example, the following command enables Proxy ARP on IP interface 2.2.2.2:

ip/2.2.2.2# proxy enabled

ip/2.2.2.2#

1 2 ... 126 127 128 129 130 131 132 133 134 135 136 ... 373 374

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Avaya Configuring IP, ARP, RIP, and OSPF Services Manual de usuario Pagina 131