2-12 Proxy ARP ConfigurationWhen configuring proxy ARP, go to these sections for information you are interested in:z Proxy ARP Overviewz Configuring Proxy ARPz Proxy ARP Configuration ExamplesProxy ARP OverviewIntroduction to Proxy ARPWith the proxy ARP feature enabled on the switch, hosts on the same network segment but differentphysical networks appear as if they on the same physical network to users.Work Mechanism of Proxy ARPFigure 2-1 Work mechanism of proxy ARPAs shown in Figure 2-10:Host A and Host D are on different sub networks. When Host A (192.168.0.22/16) needs to sendpackets to Host D (192.168.1.30/16), because the mask of the two hosts are both 16 bits, Host Aregards Host D to be on its directly connected sub network, and thus Host A will broadcast an ARPrequest to request the MAC address of Host D.z When the proxy ARP feature is not enabled on the switch, because Host A and Host D are indifferent VLANs, the ARP request sent by Host A cannot reach Host D, and the two hosts cannotcommunicate.z With proxy ARP enabled on the switch, when VLAN-interface 3 receives the ARP request, if theswitch finds a route to the destination IP address (encapsulated in the ARP request) in the routingtable, the switch sends host A the MAC address of VLAN-interface 3 in an ARP response (with the
