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usr.sbin/arp/arp.4
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||||
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||||
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||||
.\" SUCH DAMAGE. | .\" SUCH DAMAGE. | ||||
.\" | .\" | ||||
.\" @(#)arp4.4 6.5 (Berkeley) 4/18/94 | .\" @(#)arp4.4 6.5 (Berkeley) 4/18/94 | ||||
.\" $FreeBSD$ | .\" $FreeBSD$ | ||||
.\" | .\" | ||||
.Dd November 5, 2013 | .Dd October 1, 2016 | ||||
.Dt ARP 4 | .Dt ARP 4 | ||||
.Os | .Os | ||||
.Sh NAME | .Sh NAME | ||||
.Nm arp | .Nm arp | ||||
.Nd Address Resolution Protocol | .Nd Address Resolution Protocol | ||||
.Sh SYNOPSIS | .Sh SYNOPSIS | ||||
.Cd "device ether" | .Cd "device ether" | ||||
.Sh DESCRIPTION | .Sh DESCRIPTION | ||||
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MIB. | MIB. | ||||
.Bl -tag -width "log_arp_permanent_modify" | .Bl -tag -width "log_arp_permanent_modify" | ||||
.It Va allow_multicast | .It Va allow_multicast | ||||
Should the kernel install ARP entries with multicast bit set in | Should the kernel install ARP entries with multicast bit set in | ||||
the hardware address. | the hardware address. | ||||
Installing such entries is RFC 1812 violation, but some prorietary | Installing such entries is RFC 1812 violation, but some prorietary | ||||
load balancing techniques require routers on network to do so. | load balancing techniques require routers on network to do so. | ||||
Turned off by default. | Turned off by default. | ||||
.It Va garp_rexmit_count | |||||
Should the kernel retransmit gratuitous ARP (GARP) packets when an IPv4 address | |||||
is added to an interface. | |||||
A GARP is always transmitted when an IPv4 address is added to an interface. | |||||
A non-zero value of this sysctl will cause the GARP packet to be retransmitted | |||||
the stated number of times. | |||||
The interval between retransmissions is doubled each time, so the | |||||
retransmission intervals are: {1, 2, 4, 8, 16, ...} (seconds). | |||||
The default value of zero (0) means only the initial GARP is sent; no | |||||
markj: This convention of writing numbers isn't present elsewhere in this file - I'd just write "0". | |||||
additional GARP packets are retransmitted. | |||||
The maximum value is sixteen (16). | |||||
.Pp | |||||
Although a single GARP packet (the default behavior) is usually sufficient, in | |||||
Done Inline ActionsMissing space after the close paren. markj: Missing space after the close paren. | |||||
Done Inline ActionsSeems like a space is missing between ')' and 'i'. badger: Seems like a space is missing between ')' and 'i'. | |||||
some circumstances, such as when a shared address is passed between cluster | |||||
nodes, this single GARP may be dropped or lost. | |||||
This can lead to neighbors on the network link working with a stale ARP cache | |||||
and sending packets destined for that address to the node that previously owned | |||||
the address, which may not respond. | |||||
.It Va log_arp_movements | .It Va log_arp_movements | ||||
Should the kernel log movements of IP addresses from one hardware | Should the kernel log movements of IP addresses from one hardware | ||||
address to an other. | address to an other. | ||||
See | See | ||||
.Sx DIAGNOSTICS | .Sx DIAGNOSTICS | ||||
below. | below. | ||||
Turned on by default. | Turned on by default. | ||||
.It Va log_arp_permanent_modify | .It Va log_arp_permanent_modify | ||||
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This convention of writing numbers isn't present elsewhere in this file - I'd just write "0".