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Update arp(4) to document the net.link.ether.inet.garp_rexmit_count sysctl.

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Submitted by:	David A. Bright <david.a.bright@dell.com>
Requested by:	markj
Reviewed by:	markj, badger
MFC after:	4 weeks
X-MFC with:	r306577
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D8136
This commit is contained in:
Eric van Gyzen 2016-10-03 19:02:22 +00:00
parent 1a466ddc79
commit 35ef77a2ef
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=306652
1 changed files with 19 additions and 1 deletions
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20
usr.sbin/arp/arp.4
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@ -28,7 +28,7 @@
.\" @(#)arp4.4 6.5 (Berkeley) 4/18/94
.\" $FreeBSD$
.\"
.Dd November 5, 2013
.Dd October 3, 2016
.Dt ARP 4
.Os
.Sh NAME
@ -126,6 +126,24 @@ the hardware address.
Installing such entries is RFC 1812 violation, but some prorietary
load balancing techniques require routers on network to do so.
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 means only the initial GARP is sent; no
additional GARP packets are retransmitted.
The maximum value is sixteen.
.Pp
Although a single GARP packet (the default behavior) is usually sufficient, in
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
Should the kernel log movements of IP addresses from one hardware
address to an other.