Configuring Routed Proxy ARP

Prerequisites

Before configuring routed proxy ARP, complete the following tasks:

Configuring the physical parameters for the interface and ensuring that the status of the physical layer of the interface is Up
Configuring the link layer protocol parameters for the interface and ensuring that the status of the link layer protocol on the interface is Up

Context

The two physical networks of an enterprise are in different subnets of the same IP network, and are separated by a device. You need to enable the proxy ARP on the device interface connected to the physical networks. This enables communication between the two networks.

Network IDs of subnet hosts must be the same. You do not need to configure default gateways for hosts.

Procedure

Access the system view.
```
system-view
```
Access the interface view.
```
interface interface-type interface-number
```
The interfaces supporting routed proxy ARP include Ethernet interfaces, Ethernet sub-interfaces, GE interfaces, GE sub-interfaces, Eth-Trunk interfaces, Eth-Trunk sub-interfaces, and VLANIF interfaces.
Configure an IP address for the interface.
```
ip address ip-address { mask | mask-length }
```
The IP address configured for the interface must be in the same network segment with that of hosts in the LAN connected to this interface.
Enable the routed proxy ARP function on an interface.
```
arp-proxy enable
```
By default, the routed proxy ARP function is disabled on the interface.

After routed proxy ARP is enabled, you must reduce the aging time of ARP entries in the device so that the number of packets received but cannot be forwarded by the device is decreased. To configure the aging time of ARP entries.