
Configuring IP Routers and Interfaces
2-11
There are devices that use Proxy ARP to determine a gateway rather than relying
on a statically defined default gateway. These devices will use ARP for all remote
destinations. To enable the router to reply to ARP for remote destinations on other
networks, you must enable the IP Interface Proxy ARP parameter and set the IP
Global Nonlocal ARP Destination parameter to Accept. For instructions, see the
Nonlocal ARP Destination parameter on page 2-56.
Figure 2-4. Proxy ARP Example
Inverse ARP
Inverse ARP enables address resolution for Frame Relay interfaces. It is used to
discover the IP address of the station at the remote end of the virtual circuit.
HP Probe
HP Probe, a Hewlett-Packard proprietary protocol, is an address-resolution
mechanism that functions much like ARP to determine a network host’s physical
address when all it knows is the network host’s IP address, by binding a 32-bit IP
address to a 48-bit MAC address.
Host
B
Host
D
Host
C
Router
140.250.200.3 140.250.250.2 140.250.250.3
Host
A
140.250.200.2
140.250.200.0 140.250.250.0
140.250.200.1
00 00 A2 00 00 01
140.250.250.1
00 00 A2 00 00 02
00 00 A2 00 10 600 00 A2 00 10 30
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