Copyright © tutorialspoint.com
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]
|Tell the user what is going on by being verbose.|
|shows numerical addresses instead of trying to determine symbolic host, port or user names.|
|-H type, --hw-type type, -t 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. The entries will be displayed in alternate (BSD) style.|
|-d hostname, --delete hostname|
|Remove any entry for the specified host. This can be used if the indicated host is brought down, for example.|
|Use the interface ifas hardware address.|
|-e||Shows the entries in default (Linux) style.|
|-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
pub entries the specified interface is the interface on which ARP requests will
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
.The format of the hardware address is dependent on the hardware 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(7) for details.
|-f filename, --file filename|
Similar to the
-s option, only this time the address info is taken from file
.This can be used if ARP entries for a lot of hosts have to be 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 hardware address and a hostname separated by whitespace. Additionally the pub, temp and netmask flags can be used.
As a special case for compatibility the order of the hostname and the hardware address can be exchanged.
Each complete entry in the ARP cache will be marked with the C flag. Permanent entries are marked with M and published entries have the P flag.
Copyright © tutorialspoint.com