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Appendix G ARP Program
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) or remote computer (residing on the different
network) through a router.
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 –a fi Use this command to view all ARP cache entries.
• arp –a plus IP address fi Use this command to view ARP cache entries
associated with one particular interface on a network with multiple adapters.
• arp –g fi Same as arp –a.
• arp –N fi Use this command to display ARP entries for specific network
interface.
• arp – s plus IP address plus Physical address fi Use this command to
manually add a permanent static entry to the ARP cache.
• arp –d fi Use this command to manually delete a static entry.
Ping the destination computer using IP address first before using the arp -a
command.
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
Figure G-1 ARP Commands and Responses
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