There is no function "save" in the iptables init script. Moreover I don't
think it is a
good idea to save the chains upon "stop". If you messed up your chains and
say "stop" to turn iptables off, your old working setup will be gone as
well. 

--- iptables.orig       Thu Mar  1 17:19:36 2001
+++ iptables    Thu Mar  1 17:19:56 2001
@@ -95,7 +95,6 @@
        ;;
 
   stop)
-       save
        stop
        ;;