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author | Eric van Gyzen <vangyzen@FreeBSD.org> | 2016-10-03 19:02:22 +0000 |
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committer | Eric van Gyzen <vangyzen@FreeBSD.org> | 2016-10-03 19:02:22 +0000 |
commit | 35ef77a2eff0cdb9c8726a208843a84efdf5d019 (patch) | |
tree | f7401b1fa58d902cec6c28b19a82981ecff350d7 /usr.sbin/arp/arp.4 | |
parent | 1a466ddc7986e4243a819ecb735187b80e3b57f4 (diff) | |
download | src-35ef77a2eff0cdb9c8726a208843a84efdf5d019.tar.gz src-35ef77a2eff0cdb9c8726a208843a84efdf5d019.zip |
Update arp(4) to document the net.link.ether.inet.garp_rexmit_count sysctl.
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
Notes
Notes:
svn path=/head/; revision=306652
Diffstat (limited to 'usr.sbin/arp/arp.4')
-rw-r--r-- | usr.sbin/arp/arp.4 | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/usr.sbin/arp/arp.4 b/usr.sbin/arp/arp.4 index 7bfa8ecf287f..36768c1d2314 100644 --- a/usr.sbin/arp/arp.4 +++ b/usr.sbin/arp/arp.4 @@ -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. |