ARP table

ARP table

 If the destination MAC address is not known, it will look up the destination MAC address by initiating the ARP process. Then, in preparation for the next communication, it adds the correspondence information between the learned destination IP address and MAC address to its own ARP table.

 By referring to this ARP table from the next communication, you can know the MAC address, so you do not need to perform the ARP process.


Let's take a look at the ARP table using a Windows PC.

Start Command Prompt.

c:\>arp -a


Then the current ARP table of your computer will be displayed.

By the way, the options of the ARP command are as follows.

-a (IP address)Show entries from the ARP cache table.
-d [IP address] (Interface)Delete an ARP entry.
-gSame as -a
-N [Interface]Show ARP entries for the specified interface number.
-s [IP address] [Mac Address] (Interface)Add to ARP table.