ip proxy-arp — interface
ip proxy-arp no ip proxy-arp
The proxy-arp feature for an interface
ARP allows machines to find hardware addresses (MAC addresses) using the corresponding IP addresses. The router’s proxy-arp feature helps the machines find each other across subnets. When a host sends an ARP packet requesting information about a host that can’t receive the ARP broadcast, the router helps out by responding to the ARP packet on behalf of the requested host.
While proxy-arp is often useful, it can be a burden on the router in large networks. Disabling proxy-arp and relying on proper subnetting is a better solution than relying on proxy-arp to solve subnetting problems.
The following commands disable proxy-arp on
ethernet0. All hosts on this subnet must have the proper subnet mask because proxy-arp isn’t there to help them.
interface ethernet0 ip address 10.10.1.64 255.255.255.224 no ip proxy-arp