GNU/Linux man pages
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GNU/Linux |
CentOS 4.8 |
i386 |
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arp(8) |
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arp − manipulate the system ARP cache
arp [−evn] [−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]
Arp manipulates the kernel’s ARP cache in various ways. The primary options are clearing an address mapping entry and manually setting up one. For debugging purposes, the arp program also allows a complete dump of the ARP cache.
−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, −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.
−D, −−use-device
Use the interface ifa’s hardware address.
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−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 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(7) for details.
−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.
In all places where a hostname is expected, one can also enter an IP address in dotted-decimal notation.
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.
/proc/net/arp,
/etc/networks
/etc/hosts
/etc/ethers
rarp(8), route(8), ifconfig(8), netstat(8)
Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org> with a lot of improvements from net-tools Maintainer Bernd Eckenfels <net-tools@lina.inka.de>.
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arp(8) | |