Skip to Main Content
Cisco IOS in a Nutshell, 2nd Edition
book

Cisco IOS in a Nutshell, 2nd Edition

by James Boney
August 2005
Intermediate to advanced content levelIntermediate to advanced
798 pages
31h 12m
English
O'Reilly Media, Inc.
Content preview from Cisco IOS in a Nutshell, 2nd Edition

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
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

CISCO IOS in a Nutshell

CISCO IOS in a Nutshell

James Boney
Cisco IOS Cookbook, 2nd Edition

Cisco IOS Cookbook, 2nd Edition

Kevin Dooley, Ian Brown
Cisco Software-Defined Access

Cisco Software-Defined Access

Srilatha Vemula, Jason Gooley, Roddie Hasan

Publisher Resources

ISBN: 0596008694Errata