Overview
The ARP plug and play (PnP) feature is typically configured on a gateway. This feature allows end users to access the gateway without changing their IP addresses on subnets different from the subnet where the gateway resides.
After ARP PnP is enabled on an interface, it provides the following functions:
ARP PnP enables the interface to always reply to users' ARP requests with the interface's MAC address.
Upon receiving a packet from the user, ARP PnP replaces the source IP address of the packet with an agent IP address. The agent IP address is on the same subnet as the interface IP address.
Upon receiving the return packet destined to the agent IP address, ARP PnP replaces the agent IP with the user's original IP address.