D20345.diff
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	Index: head/sbin/dumpon/dumpon.8
	===================================================================
	--- head/sbin/dumpon/dumpon.8
	+++ head/sbin/dumpon/dumpon.8
	@@ -28,7 +28,7 @@
	.\" From: @(#)swapon.8 8.1 (Berkeley) 6/5/93
	.\" $FreeBSD$
	.\"
	-.Dd May 6, 2019
	+.Dd May 21, 2019
	.Dt DUMPON 8
	.Os
	.Sh NAME
	@@ -317,6 +317,49 @@
	which can be examined by looking at the
	.Va kern.bootfile
	.Xr sysctl 8 .
	+.Pp
	+The
	+.Nm
	+.Xr rc 8
	+script runs early during boot, typically before networking is configured.
	+This makes it unsuitable for configuring
	+.Xr netdump
	+when the client address is dynamic.
	+To configure
	+.Xr netdump
	+when
	+.Xr dhclient
	+binds to a server,
	+.Xr dhclient-script
	+can be used to run
	+.Xr dumpon .
	+For example, to automatically configure
	+.Xr netdump
	+on the vtnet0 interface, add the following to
	+.Pa /etc/dhclient-exit-hooks .
	+.Bd -literal
	+case $reason in
	+BOUND\|REBIND\|REBOOT\|RENEW)
	+ if [ "$interface" != vtnet0 ] \|\| [ -n "$old_ip_address" -a \\
	+ "$old_ip_address" = "$new_ip_address" ]; then
	+ break
	+ fi
	+ if [ -n "$new_routers" ]; then
	+ # Take the first router in the list.
	+ gateway_flag="-g ${new_routers%% *}"
	+ fi
	+ dumpon -c $new_ip_address -s $server $gateway_flag vtnet0
	+ ;;
	+esac
	+.Ed
	+.Pp
	+Be sure to fill in the server IP address and change the interface name if
	+needed, and to configure
	+.Pp
	+.Dl dumpdev="NO"
	+.Pp
	+in
	+.Pa /etc/rc.conf .
	.Sh SEE ALSO
	.Xr gzip 1 ,
	.Xr kgdb 1 ,