Fault-Tolerant Routing
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Host C has an IP address of 10.1.0.99 and a default gateway of 10.1.0.99.
Note that the IP address and default gateway should be the same when cli-
ents are configured in a Proxy ARP environment. Host C will use ARP for
every single IP address to which it wants to connect, regardless of whether it
is on the local segment.
Enabling Proxy ARP on Cisco Routers
Proxy ARP is enabled on Cisco routers by default, as displayed in the results
of the following show ip interface command:
RouterA#show ip interface ethernet 0
Ethernet0 is up, line protocol is up
Internet address is 10.1.0.1/16
Broadcast address is 255.255.255.255
Address determined by setup command
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Multicast reserved groups joined: 224.0.0.9
Outgoing access list is not set
Inbound access list is not set
Proxy ARP is enabled
Security level is default
Split horizon is enabled
ICMP redirects are always sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is enabled
IP fast switching on the same interface is disabled
IP Null turbo vector
IP multicast fast switching is disabled
IP multicast distributed fast switching is disabled
Router Discovery is disabled
IP output packet accounting is disabled
IP access violation accounting is disabled
TCP/IP header compression is disabled
Probe proxy name replies are disabled
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