add net.inet6.ip6.mforwarding which was forgotten when the variable was added.

src/etc/sysctl.conf

@@ -1,4 +1,4 @@
-#	$OpenBSD: sysctl.conf,v 1.40 2006/01/28 18:22:43 brad Exp $
+#	$OpenBSD: sysctl.conf,v 1.41 2007/01/09 04:11:29 itojun Exp $
 #
 # This file contains a list of sysctl options the user wants set at
 # boot time.  See sysctl(3) and sysctl(8) for more information on
@@ -7,6 +7,7 @@
 #net.inet.ip.forwarding=1	# 1=Permit forwarding (routing) of IPv4 packets
 #net.inet.ip.mforwarding=1	# 1=Permit forwarding (routing) of IPv4 multicast packets
 #net.inet6.ip6.forwarding=1	# 1=Permit forwarding (routing) of IPv6 packets
+#net.inet6.ip6.mforwarding=1	# 1=Permit forwarding (routing) of IPv6 multicast packets
 #net.inet6.ip6.accept_rtadv=1	# 1=Permit IPv6 autoconf (forwarding must be 0)
 #net.inet.tcp.rfc1323=0		# 0=Disable TCP RFC1323 extensions (for if tcp is slow)
 #net.inet.tcp.rfc3390=0		# 0=Disable RFC3390 for TCP window increasing