--- old/lib.providers
+++ new/lib.providers
@@ -141,7 +141,7 @@
 # Add Provider $table ($number)
 #
 __EOF__
-	save_command "if interface_is_usable $interface; then"
+	save_command "if [ -n \"$interface\" ] && interface_is_usable \"$interface\"; then"
 	save_indent1="$INDENT"
 	INDENT="$INDENT    "
 
@@ -283,7 +283,14 @@
     INDENT="$save_indent1"
     save_command else
 
-    if [ -n "$optional" ]; then
+    if [ "${interface:--}" = "-" -a "${duplicate:--}" = "-" -a "${gateway:--}" = "-" -a "${options:--}" = "-" -a "${copy:--}" = "-" ]; then
+        indent >&3 << __EOF__
+
+progress_message "   Provider $table ($number) Added"
+
+__EOF__
+
+    elif [ -n "$optional" ]; then
 	save_command "    error_message \"WARNING: Interface $interface is not configured -- Provider $table ($number) not Added\""
 	save_command "    ${iface}_up="
     else
@@ -316,10 +323,6 @@
 	[ "x$source"   = x- ] && source=
 	[ "x$dest"     = x- ] && dest= || dest="to $dest"
 
-	[ -n "${source}${dest}" ] || fatal_error "You must specify either the source or destination in an rt rule: \"$rule\""
-
-	[ -n "${dest:=to 0.0.0.0/0}" ]
-
 	if [ -n "$source" ]; then
 	    case $source in
 		*:*)
@@ -332,8 +335,6 @@
 		    source="iif $source"
 		    ;;
 	    esac
-	else
-	    source='from 0.0.0.0/0'
 	fi
 
 	case "$priority" in