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Quick links About
arp
Syntax
Examples
Related commands
Linux / Unix main page
About arp
Manipulate the system ARP
cache.
Syntax
arp [-vn] [-H type] [-i if] -a [hostname]
arp [-v] [-i if] -d hostname [pub]
arp [-v] [-H type] [-i if] -s hostname hw_addr [temp]
arp [-v] [-H type] [-i if] -s hostname hw_addr [netmask nm] pub
arp [-v] [-H type] [-i if] -Ds hostname ifa [netmask nm] pub
arp [-vnD] [-H type] [-i if] -f [filename]
| -v, --verbose |
Tell the user what is going on
by being verbose. |
| -n, --numeric |
shows numerical addresses
instead of trying to determine symbolic host, port or user
names. |
| -H type, --hw-type
type |
When setting or reading the ARP
cache, this optional parameter tells arp which class of
entries it should check for. The default value of this
parameter is ether (i.e. hardware code 0x01 for IEEE 802.3
10Mbps Ethernet). Other values might include network
technologies such as ARCnet (arcnet) , PROnet (pronet) ,
AX.25 (ax25) and NET/ROM (netrom). |
| -a [hostname],
--display [hostname] |
Shows the entries of the
specified hosts. If the hostname parameter is not used, all
entries will be displayed. |
| -d hostname,
--delete hostname |
Remove any entry for the
specified host. This can be used if the indicated host is
brought down, for example. |
| -D, --use-device |
Use the interface ifa's hardware
address.
|
| -i If, --device If |
Select an interface. When
dumping the ARP cache only entries matching the specified
interface will be printed. When setting a permanent or temp
ARP entry this interface will be associated with the entry;
if this option is not used, the kernel will guess based on
the routing table. For pub entries the specified interface
is the interface on which ARP requests will be answered.
NOTE: This has to be different from the interface to
which the IP datagrams will be routed. |
| -s hostname hw_addr,
--set hostname |
Manually create an ARP address
mapping entry for host hostname with hardware address set to
hw_addr class, but for most classes one can assume that the
usual presentation can be used. For the Ethernet class, this
is 6 bytes in hexadecimal, separated by colons. When adding
proxy arp entries (that is those with the publish flag set a
netmask may be specified to proxy arp for entire subnets.
This is not good practice, but is supported by older kernels
because it can be useful. If the temp flag is not supplied
entries will be permanent stored into the ARP cache. NOTE:
As of kernel 2.2.0 it is no longer possible to set an ARP
entry for an entire subnet. Linux instead does automagic
proxy arp when a route exists and it is forwarding. See arp
for details. Also the dontpub option which is available for
delete and set operations cannot be used with 2.4 and newer
kernels. |
| -f filename, --file
filename |
Similar to the -s option, only
this time the address info is taken from file filename set
up. The name of the data file is very often /etc/ethers, but
this is not official. If no filename is specified
/etc/ethers is used as default. The format of the file is
simple; it only contains ASCII text lines with a hostname,
and a hardware address separated by whitespace. Additionally
the pub, temp and netmask flags can be used. |
Examples
arp
Display network card and Ethernet connectivity.
Related commands
ifconfig
netstat
route
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