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Chapter 8
Hot Standby Routing Protocol (HSRP)
Policy routing is disabled
Network address translation is disabled
Web Cache Redirect is disabled
BGP Policy Mapping is disabled
RouterA#
If you need to enable Proxy ARP on an interface because you had disabled
it, use the ip proxy arp command at interface level:
RouterA#conf t
RouterA(config)#interface ethernet 0
RouterA(config-if)#ip proxy-arp
RouterA(config-if)#^Z
Disabling Proxy ARP on Cisco Routers
Proxy ARP can also be disabled on the router by using the no ip proxy-arp
command, as shown here:
RouterA#conf t
RouterA(config)#interface ethernet 0
RouterA(config-if)#no ip proxy-arp
RouterA(config-if)#^Z
Going back to the example in Figure 8.2, when Host C tries to connect to
any IP address, it sends out an ARP request. Both Router A and Router B
reply to this broadcast with their own MAC addresses. Host C accepts the
first response that it receives and places an entry into the local ARP table.
The entry will stay in the ARP table until it expires, which can be from min-
utes to hours, depending on the operating system.
Cisco routers default to four-hour ARP time-out.
In this example, when Host C tries to ping 14.4.4.4, it gets the following
results:
C:\>ping 14.4.4.4
Pinging 14.4.4.4 with 32 bytes of data:
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