arp command

  • Thread starter Thread starter josh
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josh

I'm wondering what the purpose of running the arp -a
command and switch for the network card is/does. Does
this just verify the network card is being seen by windows
which shows the nic adapter address,etc?
 
ARP is the address resolution protocol. -a dumps the list of mappings
between IP address and physical addresses for your local subnet.
 
josh said:
I'm wondering what the purpose of running the arp -a
command and switch for the network card is/does. Does
this just verify the network card is being seen by windows
which shows the nic adapter address,etc?
Click to expand...


If you don't know what it does, you don't need to use it :-)

When an IP machine on a LAN talks to another IP machine on the same LAN, the
IP protocol does not need to send the data to a router, because the
destination is on the local subnet.

So it uses a protocol called ARP ( Address Resolution Protocol) to discover
the MAC ( Hardware, or LAN ) address of the network card of the destination
machine associated with the destination IP address.

To avoid excessive broadcast ARP requests, machines remember ('cache' ) this
answer for a few minutes, in the ARP cache.

This is what you see.
 
Hey guys
arp -a displays the arp table

regards
yellowpike



Ken Wickes said:
ARP is the address resolution protocol. -a dumps the list of mappings
between IP address and physical addresses for your local subnet.

--

Ken Wickes [MSFT]
This posting is provided "AS IS" with no warranties, and confers no rights.


josh said:
I'm wondering what the purpose of running the arp -a
command and switch for the network card is/does. Does
this just verify the network card is being seen by windows
which shows the nic adapter address,etc?
Click to expand...
Click to expand...
 
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