TP-Link T3700G-28TQ T3700G-28TQ V1 UG - Page 166
Routing, Proxy ARP, Proxy ARP Config, Proxy ARP Information
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Within the same network segment, hosts connecting with different VLAN interfaces can communicate with each other through Layer 3 forwarding by using proxy ARP function. The following example simply illustrates how proxy ARP works. Figure 10-19 ARP Application As shown in the figure above, PC A and PC B are in the same network segment but belong to different VLANs respectively. When PC A wants to contact PC B, PC A will broadcast its ARP request with Destination IP address of PC B in its ARP packet. As the two are in different VLANs, the ARP request cannot be forwarded to PC B, and thereby the two cannot communicate with each other. To realize the connectivity between the two PCs, we enable the Proxy ARP function for the corresponding VLAN interface 2 and VLAN interface 3 on the Switch. Upon receiving the ARP request of PC A, VLAN interface 2 responds to the request with its own MAC address instead of PC B's actual MAC address. When PC A sends a packet to the Switch which is actually destined to PC B, the Switch just forwards the packet to PC B. The communication between PC A and B is realized totally unaware of the Switch proxying for each other. On this page you can enable Proxy ARP function for the VLAN interface. Choose the menu Routing→Proxy ARP→Proxy ARP to load the following page. Figure 10-20 Proxy ARP The following entries are displayed on this screen: Proxy ARP Config Here you can configure the Proxy ARP function. Search Default Route: If enabled, default route is included when searching arp proxy. Proxy ARP Information Select: Select the desired item for configuration. It is multi-optional. 155