3Com 2928 User Guide - Page 342
Static ARP entry, Managing ARP Entries
UPC - 662705557113
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Static ARP entry A static ARP entry is manually configured and maintained. It cannot get aged or be overwritten by a dynamic ARP entry. Using static ARP entries enhances communication security. After a static ARP entry is specified, only a specific MAC address is associated with the specified IP address. Attack packets cannot modify the IP-to-MAC mapping. Thus, communications between devices are protected. Static ARP entries can be classified into permanent or non-permanent. z A permanent static ARP entry can be directly used to forward packets. When configuring a permanent static ARP entry, you must configure a VLAN and an outbound interface for the entry besides the IP address and the MAC address. z A non-permanent static ARP entry has only an IP address and a MAC address configured. It cannot be directly used for forwarding data. If a non-permanent static ARP entry matches an IP packet to be forwarded, the device sends an ARP request first. If the sender IP and MAC addresses in the received ARP reply are the same as those in the non-permanent static ARP entry, the device adds the interface receiving the ARP reply to the non-permanent static ARP entry. Then the entry can be used for forwarding IP packets. Usually ARP dynamically resolves IP addresses to MAC addresses, without manual intervention. Managing ARP Entries Displaying ARP Entries Select Network > ARP Management from the navigation tree to enter the default ARP Table page shown in Figure 1-3. All ARP entries are displayed on the page. Figure 1-3 ARP Table configuration page 1-3
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