1.1-PC1无默认网关/Proxy-ARP（代理ARP）

1.1-PC1无默认网关/Proxy-ARP（代理ARP）

2、命令部署：PC1(config)#no ip default-gateway 12.1.1.2拓展：PC1(config)#default int int f0/0

3、验证：（1）默认开启代理：R2#debug arpARP packet debugging is onPC1#ping 3.3.3.3

R2#Mar 1 00:16:17.167: IP ARP: rcvd req src 12.1.1.1 c001.1858.0000, dst 3.3.3.3 FastEthernet0/0Mar 1 00:16:17.171: IP ARP: creating entry for IP address: 12.1.1.1, hw: c001.1858.0000*Mar 1 00:16:17.171: IP ARP: sent rep src 3.3.3.3 c002.3430.0000,dst 12.1.1.1 c001.1858.0000 FastEthernet0/0注意：可以看到3.3.3.3对应的MAC是：c002.3430.0000，这是R2 f0/0的接口MAC地址。证明：此过程是Proxy-ARP

PC1#show arpProtocol Address Age (min) Hardware Addr Type InterfaceInternet 3.3.3.3 3 c002.3430.0000 ARPA FastEthernet0/0Internet 12.1.1.1 - c001.1858.0000 ARPA FastEthernet0/0

（2）关闭代理功能：R2(config)#int f0/0R2(config-if)#no ip proxy-arp

PC1#ping 3.3.3.3Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:.....Success rate is 0 percent (0/5)

R2#*Mar 1 00:56:05.231: IP ARP: rcvd req src 12.1.1.1 c001.1858.0000, dst 3.3.3.3 FastEthernet0/0

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