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NetStructure™ 480T Routing Switch User Guide
Proxy ARP
Proxy Address Resolution Protocol (ARP) was first invented so that
ARP-capable devices could respond to ARP request packets on
behalf of ARP-incapable devices.
Proxy ARP can also be used to achieve router redundancy and
simplify IP client configuration. The switch supports proxy ARP for
this type of network configuration.
ARP-Incapable Devices
To configure the switch to respond to ARP requests on behalf of
devices that are incapable of doing so, you must configure the IP
address and MAC address of the ARP-incapable device using this
command:
configure iparp add proxy <ipaddress> {<mask>}
<mac_address> {always}
Once configured, the system responds to ARP requests on behalf of
the device, if these conditions are satisfied:
• The valid IP ARP request is received on a router interface.
• The target IP address matches the IP address configured in the
proxy ARP table.
• The proxy ARP table entry indicates that the system should
always answer this ARP request, regardless of the ingress VLAN
(the
always parameter must be applied).
Once all the proxy ARP conditions are met, the switch formulates
an ARP input rules for the UDP-configured MAC address in the
packet.
Proxy ARP Between Subnets
In some networks, it is desirable to configure the IP host with a
wider subnet than the actual subnet mask of the segment.
Proxy ARP can be used so that the router answers ARP requests for
devices outside of the subnet. As a result, the host communicates as
if all devices are local. In reality, communication with devices
outside of the subnet are proxied by the router.