4.6 ARP Protocol

ARP is the Internet layer protocol responsible for matching or obtaining the MAC

(hardware) address that corresponds to a particular IP address. The ARP

command allows the user to view the current contents of the ARP cache of the

local computer (residing on the same network). Microsoft includes the ARP.EXE

utility for viewing and modifying the ARP cache with its Windows products. The

following ARP commands can be used to view cache entries:

arp –aUse this command to view all ARP cache entries.

arp –a plus IP addressUse this command to view ARP cache entries

associated with one particular interface on a network with multiple adapters.

arp –gSame as arp –a.

arp –NUse this command to display ARP entries for specific network interface.

arp – s plus IP address plus Physical addressUse this command to

manually add a permanent static entry to the ARP cache.

arp –d plus IP addressUse this command to manually delete a static entry.

The following window shows examples of arp commands and responses.

• Your computer has an IP address of 192.168.1.118

The destination computer has an IP address of 192.168.1.96

C:\>ping 192.168.1.96

Pinging 192.168.1.96 with 32 bytes of data:

Reply from 192.168.1.96=bytes=32 time=5ms TTL=32

Reply from 192.168.1.96=bytes=32 time=3ms TTL=32

Reply from 192.168.1.96=bytes=32 time=3ms TTL=32

Reply from 192.168.1.96=bytes=32 time=4ms TTL=32

C:\>arp -a 192.168.1.96

Interface: 192.168.1.118

Internet Address Physical Addresss Type

192.168.1.96 00-03-34-00-00-23 dynamic 00-03-34-00-00-23

C:\>arp -d 192.168.1.96

C:\>arp -a 192.168.1.96

No ARP Entries Found

C:\>

Figure 4.27 ARP Commands and Responses

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Omega Speaker Systems wi Series manual ARP Protocol, ARP Commands and Responses

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