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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
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=306652
@ -28,7 +28,7 @@
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.\" @(#)arp4.4 6.5 (Berkeley) 4/18/94
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.\" $FreeBSD$
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.\"
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.Dd November 5, 2013
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.Dd October 3, 2016
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.Dt ARP 4
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.Os
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.Sh NAME
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@ -126,6 +126,24 @@ the hardware address.
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Installing such entries is RFC 1812 violation, but some prorietary
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load balancing techniques require routers on network to do so.
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Turned off by default.
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.It Va garp_rexmit_count
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Should the kernel retransmit gratuitous ARP (GARP) packets when an IPv4 address
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is added to an interface.
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A GARP is always transmitted when an IPv4 address is added to an interface.
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A non-zero value of this sysctl will cause the GARP packet to be retransmitted
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the stated number of times.
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The interval between retransmissions is doubled each time, so the
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retransmission intervals are: {1, 2, 4, 8, 16, ...} (seconds).
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The default value of zero means only the initial GARP is sent; no
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additional GARP packets are retransmitted.
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The maximum value is sixteen.
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.Pp
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Although a single GARP packet (the default behavior) is usually sufficient, in
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some circumstances, such as when a shared address is passed between cluster
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nodes, this single GARP may be dropped or lost.
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This can lead to neighbors on the network link working with a stale ARP cache
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and sending packets destined for that address to the node that previously owned
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the address, which may not respond.
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.It Va log_arp_movements
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Should the kernel log movements of IP addresses from one hardware
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address to an other.
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