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do not perform IPv6 initialization for loopback interface.
MUST make lo0 up before any IPv6 operations.
it will be considered a pilot error if you don't.
(I prefer to have lo0 initialized automatically)

#!/bin/sh -
#
#	$OpenBSD: netstart,v 1.52 1999/12/09 13:59:57 itojun Exp $

# Returns true if $1 contains only alphanumerics
isalphanumeric() {
	local _n
	_n=$1
	while [ ${#_n} != 0 ]; do
		case $_n in
			[A-Za-z0-9]*)	;;
			*)		return 1;;
		esac
		_n=${_n#?}
	done
	return 0
}

# /etc/myname contains my symbolic name
#
hostname=`cat /etc/myname`
hostname $hostname
if [ -f /etc/defaultdomain ]; then
	domainname `cat /etc/defaultdomain`
fi

# pick up option configuration
. /etc/rc.conf

# Configure the IP filter before configuring network interfaces
if [ X"${ipfilter}" = X"YES" -a -f "${ipfilter_rules}" ]; then
	echo 'configuring IP filter'
	ipf -Fa -f ${ipfilter_rules} -E
else
	ipfilter=NO
fi

# set the address for the loopback interface
# it will also initialize IPv6 address for lo0 (::1 and others).
ifconfig lo0 inet localhost

# use loopback, not the wire
route -n add -host $hostname localhost
route -n add -net 127 127.0.0.1 -reject

# configure all of the non-loopback interfaces which we know about.
# refer to hostname.if(5) and bridgename.if(5)
for hn in /etc/hostname.*; do
    # Strip off /etc/hostname. prefix
    if=${hn#/etc/hostname.}

    # Interface names must be alphanumeric only.  We check to avoid
    # configuring backup or temp files, and to catch the "*" case.
    if ! isalphanumeric "$if"; then
        continue
    fi
    ifconfig $if > /dev/null 2>&1
    if [ "$?" != "0" ]; then
	continue
    fi

    # Now parse the hostname.* file
    {
        read af name mask bcaddr extras

	# $af can be either "dhcp", "up" or an address family.
	case "$af" in
	"bridge")
	    cmd="echo ${hn}: bridges now supported via bridgename.* files"
	    ;;
	"dhcp")
	    ifconfig $if $name $mask $bcaddr $extras down
	    cmd="dhclient $if"
	    ;;
	"up")
	    # The only one of these guaranteed to be set is $if
	    # the remaining ones exist so that media controls work
	    cmd="ifconfig $if $name $mask $bcaddr $extras up"
 	    ;;
 	*)
            read dt dtaddr
	    if [ ! -n "$name" ]; then
		echo "/etc/hostname.$if: invalid network configuration file"
		continue
	    fi

	    cmd="ifconfig $if $af $name "
	    if [ "${dt}" = "dest" ]; then cmd="$cmd $dtaddr"; fi
	    if [ -n "$mask" ]; then cmd="$cmd netmask $mask"; fi
	    if [ -n "$bcaddr" -a "X$bcaddr" != "XNONE" ]; then
		cmd="$cmd broadcast $bcaddr";
	    fi
	    cmd="$cmd $extras";
	    ;;
	esac

	eval "$cmd"
    } < /etc/hostname.$if
done
for bn in /etc/bridgename.*; do
    # Strip off /etc/bridgename. prefix
    if=${bn#/etc/bridgename.}

    # Interface names must be alphanumeric only.  We check to avoid
    # configuring backup or temp files, and to catch the "*" case.
    if ! isalphanumeric "$if"; then
        continue
    fi
    brconfig $if > /dev/null 2>&1
    if [ "$?" != "0" ]; then
	continue
    fi

    # Now parse the bridgename.* file
    {
	# All lines are run as brconfig(8) commands.
	while read line ; do
	    line=${line%%#*}		# strip comments
	    test -z "$line" && continue
	    brconfig $if $line
	done
    } < /etc/bridgename.$if
done

# /etc/mygate, if it exists, contains the name of my gateway host
# that name must be in /etc/hosts.
if [ -f /etc/mygate ]; then
	route -n add -host default `cat /etc/mygate`
fi

# Multicast routing.
#
# The routing to the 224.0.0.0/4 net is setup according to these rules:
# multicast_host	multicast_router	route		comment
# NO			NO			-reject		no multicast
# NO			YES			none installed	daemon will run
# YES/interface		NO			-interface	YES=def. iface
#	   Any other combination		-reject		config error
case "$multicast_host:$multicast_router" in
NO:NO)
	route -n add -net 224.0.0.0/4 -interface 127.0.0.1 -reject;;
NO:YES)
	;;
*:NO)
	set `if [ $multicast_host = YES ]; then
		ed -s '!route -n show' <<EOF
/^default/p
EOF
	else
		ed -s "!ifconfig $multicast_host" <<EOF
/^	inet /p
EOF
	fi`
	route -n add -net 224.0.0.0/4 -interface $2;;
*:*)
	echo 'config error, multicasting disabled until rc.conf is fixed'
	route -n add -net 224.0.0.0/4 -interface 127.0.0.1 -reject;;
esac
	
# Configure NAT after configuring network interfaces
if [ "${ipnat}" = "YES" -a "${ipfilter}" = "YES" -a -f "${ipnat_rules}" ]; then
	echo 'configuring NAT'
	ipnat -CF -f ${ipnat_rules}
else
	ipnat=NO
fi