NAT requires IPF

src/etc/netstart

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$OpenBSD: netstart,v 1.31 1997/11/04 09:15:31 deraadt Exp $
+#	$OpenBSD: netstart,v 1.32 1997/11/29 02:03:43 kstailey Exp $
 
 # /etc/myname contains my symbolic name
 #
@@ -24,7 +24,7 @@ fi
 
 # Configure NAT before configuring network interfaces
 #
-if [ X"${nat}" = X"YES" -a -f "${nat_rules}" ]; then
+if [ "${nat}" = "YES" -a "${ipfilter}" = "YES" -a -f "${nat_rules}" ]; then
 	echo 'configuring NAT'
 	ipnat -CF -f ${nat_rules}
 else

src/etc/rc.conf

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$OpenBSD: rc.conf,v 1.3 1997/11/23 11:54:16 maja Exp $
+#	$OpenBSD: rc.conf,v 1.4 1997/11/29 02:03:43 kstailey Exp $
 
 # set these to "NO" to turn them off.  otherwise, they're used as flags
 routed_flags=NO		# for 'normal' use: routed_flags=-q
@@ -23,7 +23,7 @@ gated=NO
 kerberos_server=NO
 amd=NO
 ipfilter=NO
-nat=NO
+nat=NO				# for "YES" ipfilter must also be "YES"
 portmap=YES			# almost always needed
 inetd=YES			# almost always needed
 lpd=NO				# printing daemons