Method used to configure the proxy ARP on USG firewalls

The proxy ARP is also known as the routed proxy ARP. When the default gateway address is not configured for the host (the route to the medium system of the local network is unknown), a local host can send an ARP request (requesting for the MAC address of the destination host). Upon receiving this request, a device with the proxy ARP enabled responds to the ARP request using own MAC address. In this manner, internal hosts on different physical networks but having the same network number can normally communicate with each other.
You can configure the proxy ARP using the command line as follows: In the interface view, run the arp-proxy enable command. By default, the proxy ARP function is not enabled for the interface.

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