freebsd-dev/etc/rc.d/network3

#!/bin/sh
#
# $FreeBSD$
#

# PROVIDE: network3
# REQUIRE: localdaemons
# KEYWORD: FreeBSD

. /etc/rc.subr

load_rc_config 'XXX'

echo -n 'Additional TCP options:'
case ${log_in_vain} in
[Nn][Oo] | '')
	log_in_vain=0
	;;
[Yy][Ee][Ss])
	log_in_vain=1
	;;
[0-9]*)
	;;
*)
	echo " invalid log_in_vain setting: ${log_in_vain}"
	log_in_vain=0
	;;
esac

[ "${log_in_vain}" -ne 0 ] && (
    echo -n " log_in_vain=${log_in_vain}"
    sysctl net.inet.tcp.log_in_vain="${log_in_vain}" >/dev/null
    sysctl net.inet.udp.log_in_vain="${log_in_vain}" >/dev/null
)
echo '.'