Avaya Configuring IP Services Bedienungsanleitung Seite 38

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Configuring IP Services
2-10
In addition to ARP, IP routers support the following address-resolution schemes:
Proxy ARP
Inverse ARP
HP Probe
DDN and PDN
The following sections briefly describe the address-resolution schemes that can be
configured on an IP interface.
On interfaces configured for a Token Ring network, the router can send ARP
requests as spanning tree explorer (STE) packets or all route explorer (ARE)
packets. For information, see “Enabling Source Routing over Token Ring
Networks” on page 2-12.
Proxy ARP
Proxy ARP allows a router to answer a local ARP request for a remote destination.
For example, in Figure 2-4, 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.
Host B wants to talk to Host C, so Host B broadcasts an ARP request, which asks
IP address 140.250.250.2 to respond with its physical address. The router captures
Host B’s ARP request and responds with its hardware address 00 00 A2 00 00 01
and Host C’s IP address 140.250.250.2. Host B maps Host C’s IP address
140.250.250.2 to the router’s hardware address 00 00 A2 00 00 01.
With Proxy ARP enabled, the router will respond 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. For instructions, see the Enable
Default Route for Subnets parameter on page 2-60.
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