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80 Routing Configuration
Proxy Address Resolution Protocol (ARP)
This section describes the Proxy Address Resolution Protocol (ARP) feature.
Overview
• Proxy ARP allows a router to answer ARP requests where the target IP address is not the router itself
but a destination that the router can reach.
• If a host does not know the default gateway, proxy ARP can learn the first hop.
• Machines in one physical network appear to be part of another logical network.
• Without proxy ARP, a router responds to an ARP request only if the target IP address is an address
configured on the interface where the ARP request arrived.
CLI Examples
The following are examples of the commands used in the proxy ARP feature.
Example #1: Enabling Proxy ARP
To enable IP Proxy ARP:
console#config
console(config)#interface vlan 10
console(config-if-vlan10)#routing
console(config-if-vlan10)#ip proxy-arp
console(config-if-vlan10)#exit
Example #2 Viewing the Interface Information
console#show ip interface vlan 50
Primary IP Address.............................
192.150.2.1/255.255.255.0
Routing Mode................................... Enable
Administrative Mode............................ Enable
Forward Net Directed Broadcasts................ Disable
Proxy ARP...................................... Enable
Local Proxy ARP................................ Disable