1
.TH ARP 8 "5 Jan 1999" "net-tools" "Linux Programmer's Manual"
3
arp \- manipulate the system ARP cache
22
.B -s hostname hw_addr
29
.B -s hostname hw_addr
49
manipulates the kernel's ARP cache in various ways. The primary options
50
are clearing an address mapping entry and manually setting up one. For
51
debugging purposes, the
53
program also allows a complete dump of the ARP cache.
57
Tell the user what is going on by being verbose.
60
shows numerical addresses instead of trying to determine symbolic host, port
63
.B "\-H type, \-\-hw-type type"
64
When setting or reading the ARP cache, this optional parameter tells
66
which class of entries it should check for. The default value of
69
(i.e. hardware code 0x01 for IEEE 802.3 10Mbps Ethernet).
70
Other values might include network technologies such as
71
.RB "ARCnet (" arcnet ")"
73
.RB "PROnet (" pronet ")"
75
.RB "AX.25 (" ax25 ")"
77
.RB "NET/ROM (" netrom ")."
79
.B "\-a [hostname], \-\-display [hostname]"
80
Shows the entries of the specified hosts. If the
82
parameter is not used,
84
entries will be displayed.
86
.B "\-d hostname, \-\-delete hostname"
87
Remove any entry for the specified host. This can be used if the
88
indicated host is brought down, for example.
90
.B "\-D, \-\-use-device"
95
.B "\-i If, \-\-device If"
96
Select an interface. When dumping the ARP cache only entries matching
97
the specified interface will be printed. When setting a permanent or
99
ARP entry this interface will be associated with the entry; if this
100
option is not used, the kernel will guess based on the routing
103
entries the specified interface is the interface on which ARP requests will
107
This has to be different from the interface to which the IP
108
datagrams will be routed.
110
.B "\-s hostname hw_addr, \-\-set hostname"
111
Manually create an ARP address mapping entry for host
113
with hardware address set to
115
. The format of the hardware address is dependent on the hardware
116
class, but for most classes one can assume that the usual presentation
117
can be used. For the Ethernet class, this is 6 bytes in hexadecimal,
118
separated by colons. When adding proxy arp entries (that is those with
123
may be specified to proxy arp for entire subnets. This is not good
124
practice, but is supported by older kernels because it can be
127
flag is not supplied entries will be permanent stored into the ARP
131
As of kernel 2.2.0 it is no longer possible to set an ARP entry for an
132
entire subnet. Linux instead does automagic proxy arp when a route
133
exists and it is forwarding. See
137
.B "\-f filename, \-\-file filename"
140
option, only this time the address info is taken from file
142
. This can be used if ARP entries for a lot of hosts have to be
143
set up. The name of the data file is very often
145
but this is not official. If no filename is specified /etc/ethers
148
The format of the file is simple; it
149
only contains ASCII text lines with a hostname, and a hardware
150
address separated by whitespace. Additionally the
151
.BR "pub" , " temp" " and" " netmask"
154
In all places where a
156
is expected, one can also enter an
158
in dotted-decimal notation.
160
As a special case for compatibility the order of the hostname and
161
the hardware address can be exchanged.
163
Each complete entry in the ARP cache will be marked with the
165
flag. Permanent entries are marked with
167
and published entries have the
179
rarp(8), route(8), ifconfig(8), netstat(8)
181
Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org> with a lot of improvements
182
from net-tools Maintainer Bernd Eckenfels <net-tools@lina.inka.de>.
added
removed
man/en_US/arp.8
