
Customizing ARP and RARP Services
308627-14.00 Rev 00
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Selecting an Address Resolution Scheme for an IP Interface
In addition to ARP, IP supports Inverse ARP, HP Probe, and X.25
address-resolution schemes as follows:
• Inverse ARP provides address resolution for frame relay interfaces. Use
Inverse ARP to discover the IP address of the station at the remote end of the
virtual circuit.
• 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 using the host’s IP address by binding a 32-bit IP address to a
48-bit MAC address. IP supports HP Probe over Ethernet and the following
HP Probe messages:
-- Unsolicited Reply (incoming and outgoing)
-- Name Request (incoming)
-- Name Reply (outgoing)
-- Virtual Address Reply (incoming and outgoing)
-- Virtual Address Request (incoming and outgoing)
-- Proxy Request (incoming and outgoing)
-- Proxy Reply (incoming and outgoing)
IP can support the concurrent operation of HP Probe and ARP on an interface.
• ATMARP provides address resolution for a logical IP subnet (LIS) within an
ATM network, as defined in RFC 1577, Classical IP and ARP over ATM. A
router that needs the ATM address of a host on the LIS sends an ATMARP
request to the ATMARP server. For more information about classical IP over
ATM, see Configuring ATM Services.
• The X.25 address-resolution scheme is used on network interfaces that
support the X.25 DDN service.
• The RFC 877-compliant address-resolution mechanism is used on network
interfaces that support the X.25 PDN service.
Note:
If bridging is configured and enabled on the interface (in addition to IP),
the Name Request/Reply and the Proxy Request/Reply messages are bridged.
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