3com 2928 User Guide

 

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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. 

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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. 

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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. 

 

Select Network > ARP Management from the navigation tree to enter the default ARP Table page 
shown in 

. All ARP entries are displayed on the page. 

 configuration page