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NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | AUTHOR | COLOPHON |
IP-NEIGHBOUR(8) Linux IP-NEIGHBOUR(8)
ip-neighbour - neighbour/arp tables management.
ip [ OPTIONS ] neigh { COMMAND | help }
ip neigh { add | del | change | replace } { ADDR [ lladdr LLADDR ] [
nud STATE ] | proxy ADDR } [ dev DEV ] [ router ] [
extern_learn ]
ip neigh { show | flush } [ proxy ] [ to PREFIX ] [ dev DEV ] [ nud
STATE ] [ vrf NAME ]
ip neigh get ADDR dev DEV
STATE := { permanent | noarp | stale | reachable | none | incomplete
| delay | probe | failed }
The ip neigh command manipulates neighbour objects that establish
bindings between protocol addresses and link layer addresses for
hosts sharing the same link. Neighbour entries are organized into
tables. The IPv4 neighbour table is also known by another name - the
ARP table.
The corresponding commands display neighbour bindings and their
properties, add new neighbour entries and delete old ones.
ip neighbour add
add a new neighbour entry
ip neighbour change
change an existing entry
ip neighbour replace
add a new entry or change an existing one
These commands create new neighbour records or update existing
ones.
to ADDRESS (default)
the protocol address of the neighbour. It is either an
IPv4 or IPv6 address.
dev NAME
the interface to which this neighbour is attached.
proxy indicates whether we are proxying for this neigbour
entry
router indicates whether neigbour is a router
extern_learn
this neigh entry was learned externally. This option
can be used to indicate to the kernel that this is a
controller learnt dynamic entry. Kernel will not gc
such an entry.
lladdr LLADDRESS
the link layer address of the neighbour. LLADDRESS can
also be null.
nud STATE
the state of the neighbour entry. nud is an
abbreviation for 'Neighbour Unreachability Detection'.
The state can take one of the following values:
permanent
the neighbour entry is valid forever and can be
only be removed administratively.
noarp the neighbour entry is valid. No attempts to
validate this entry will be made but it can be
removed when its lifetime expires.
reachable
the neighbour entry is valid until the
reachability timeout expires.
stale the neighbour entry is valid but suspicious.
This option to ip neigh does not change the
neighbour state if it was valid and the address
is not changed by this command.
none this is a pseudo state used when initially
creating a neighbour entry or after trying to
remove it before it becomes free to do so.
incomplete
the neighbour entry has not (yet) been
validated/resolved.
delay neighbor entry validation is currently delayed.
probe neighbor is being probed.
failed max number of probes exceeded without success,
neighbor validation has ultimately failed.
ip neighbour delete
delete a neighbour entry
The arguments are the same as with ip neigh add, except that
lladdr and nud are ignored.
Warning: Attempts to delete or manually change a noarp entry
created by the kernel may result in unpredictable behaviour.
Particularly, the kernel may try to resolve this address even
on a NOARP interface or if the address is multicast or
broadcast.
ip neighbour show
list neighbour entries
to ADDRESS (default)
the prefix selecting the neighbours to list.
dev NAME
only list the neighbours attached to this device.
vrf NAME
only list the neighbours for given VRF.
proxy list neighbour proxies.
unused only list neighbours which are not currently in use.
nud STATE
only list neighbour entries in this state. NUD_STATE
takes values listed below or the special value all
which means all states. This option may occur more than
once. If this option is absent, ip lists all entries
except for none and noarp.
ip neighbour flush
flush neighbour entries
This command has the same arguments as show. The differences
are that it does not run when no arguments are given, and that
the default neighbour states to be flushed do not include
permanent and noarp.
With the -statistics option, the command becomes verbose. It
prints out the number of deleted neighbours and the number of
rounds made to flush the neighbour table. If the option is
given twice, ip neigh flush also dumps all the deleted
neighbours.
ip neigh get
lookup a neighbour entry to a destination given a device
proxy indicates whether we should lookup a proxy neigbour
entry
to ADDRESS (default)
the prefix selecting the neighbour to query.
dev NAME
get neighbour entry attached to this device.
ip neighbour
Shows the current neighbour table in kernel.
ip neigh flush dev eth0
Removes entries in the neighbour table on device eth0.
ip neigh get 10.0.1.10 dev eth0
Performs a neighbour lookup in the kernel and returns a
neighbour entry.
ip(8)
Original Manpage by Michail Litvak <mci@owl.openwall.com>
This page is part of the iproute2 (utilities for controlling TCP/IP
networking and traffic) project. Information about the project can
be found at
⟨http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2⟩.
If you have a bug report for this manual page, send it to
netdev@vger.kernel.org, shemminger@osdl.org. This page was obtained
from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
2020-08-13. (At that time, the date of the most recent commit that
was found in the repository was 2020-06-24.) If you discover any
rendering problems in this HTML version of the page, or you believe
there is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
iproute2 20 Dec 2011 IP-NEIGHBOUR(8)
Pages that refer to this page: ip(8)