Displays and modifies entries in the Address Resolution Protocol (ARP) cache, which contains one or more tables that are used to store IP addresses and their resolved Ethernet or Token Ring physical addresses. There is a separate table for each Ethernet or Token Ring network adapter installed on your computer. Used without parameters, arp displays help.
Syntax
arp[-a [InetAddr] [-NIfaceAddr]] [-g [InetAddr] [-NIfaceAddr]] [-dInetAddr [IfaceAddr]] [-sInetAddr EtherAddr [IfaceAddr]]Parameters
-a[ InetAddr] [ -NIfaceAddr]
Displays
current ARP cache tables for all interfaces. To display the ARP cache entry for
a specific IP address, use arp -a with the InetAddr parameter,
where InetAddr is an IP address. If InetAddr is not specified,
the first applicable interface is used. To display the ARP cache table for a
specific interface, use the -NIfaceAddr parameter in conjunction
with the -a parameter where IfaceAddr is the IP address assigned
to the interface. The -N parameter is case-sensitive.
-g[ InetAddr] [ -NIfaceAddr]
Identical to -a.
-d InetAddr[ IfaceAddr]
Deletes an
entry with a specific IP address, where InetAddr is the IP address. To
delete an entry in a table for a specific interface, use the IfaceAddr
parameter where IfaceAddr is the IP address assigned to the interface.
To delete all entries, use the asterisk (*) wildcard character in place of InetAddr.
-s InetAddr EtherAddr [ IfaceAddr]
Adds a static
entry to the ARP cache that resolves the IP address InetAddr to the
physical address EtherAddr. To add a static ARP cache entry to the table
for a specific interface, use the IfaceAddr parameter where IfaceAddr
is an IP address assigned to the interface.
/?
Displays help
at the command prompt.
Remarks
·
The
IP addresses for InetAddr and IfaceAddr are expressed in dotted
decimal notation.
·
The physical address for EtherAddr
consists of six bytes expressed in hexadecimal notation and separated by
hyphens (for example, 00-AA-00-4F-2A-9C).
·
Entries added with the -s
parameter are static and do not time out of the ARP cache. The entries are
removed if the TCP/IP protocol is stopped and started. To create permanent
static ARP cache entries, place the appropriate arp commands in a batch file
and use Scheduled Tasks to run the batch file at startup.
Examples
To
display the ARP cache tables for all interfaces, type:
arp -a
To
display the ARP cache table for the interface that is assigned the IP address
10.0.0.99, type:
arp -a
-N 10.0.0.99
To add a
static ARP cache entry that resolves the IP address 10.0.0.80 to the physical
address 00-AA-00-4F-2A-9C, type:
arp -s
10.0.0.80 00-AA-00-4F-2A-9C
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