Allow disabling dhcpv4 on internal ifaces.

rc.subr

@@ -152,6 +152,7 @@ _compute_nets()
     shift 1
 
     _priv="YES"
+	_no_dhcpv4="NO"
     while true
     do
         case ${1} in
@@ -163,6 +164,10 @@ _compute_nets()
                 _isp=""
             ;;
 
+			"no_dhcp")
+				_no_dhcpv4="YES"
+			;;
+
             isp=*)
                 _isp=`echo ${1} | sed -e 's/isp=//'`
             ;;
@@ -539,7 +544,10 @@ add_v4_net()
 	else
 		eval ifconfig_${_card_and_vlan}=\"${_extra_address} group internal ${_class_group} ${_extra_opts}\"
 	fi
-    eval dhcpd_ifaces=\"${dhcpd_ifaces} ${_card_dot_vlan}\"
+	if [ $(option_selected _no_dhcpv4) != "YES" ]
+	then
+		eval dhcpd_ifaces=\"${dhcpd_ifaces} ${_card_dot_vlan}\"
+	fi
 }
 
 _add_v6_prefixes()