August 2005
Intermediate to advanced
798 pages
31h 12m
English
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Name
ip proxy-arp — interface
Synopsis
ip proxy-arp no ip proxy-arp
Configures
The proxy-arp feature for an interface
Default
Enabled
Description
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.
Example
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
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.