The interface configuration mode command no ip proxy-arp can be used to disable Proxy ARP on a per-interface basis.
Although the intricacies, advantages, and disadvantages of using Proxy ARP are beyond the scope of this book, you should
explore them on your own.
Note
For more details on Proxy ARP, visit
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094adb.shtml .
Gratuitous ARP
Gratuitous Address Resolution Protocol (gARP) is an unsolicited ARP broadcast containing the IP address of the client host and
the router's MAC address. A Cisco router will send out a gARP message when a client connects and negotiates an address over PPP connection. This transmission occurs even when the client receives the address from a local address pool.
Gratuitous ARP is enabled by default on all interfaces. To disable gARP, use the no ip gratuitous-arps command from the global
configuration mode.
IP Directed Broadcast
By default, IP directed broadcast is disabled under all the interfaces in all Cisco IOS Software Version 12.0 and later. In earlier
IOS versions, the no ip directed-broadcast command was required to be applied on every interface known to forward
broadcast packets.
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