# IPv6

   ##
   ## set default policies to let everything in
   ip6tables --policy INPUT   ACCEPT;
   ip6tables --policy OUTPUT  ACCEPT;
   ip6tables --policy FORWARD ACCEPT;

   ##
   ## start fresh
   ip6tables -Z; # zero counters
   ip6tables -F; # flush (delete) rules
   ip6tables -X; # delete all extra chains

# IPv4

   ## 
   ## set default policies to let everything in
   iptables --policy INPUT   ACCEPT;
   iptables --policy OUTPUT  ACCEPT;
   iptables --policy FORWARD ACCEPT;

   ##
   ## start fresh
   iptables -Z; # zero counters
   iptables -F; # flush (delete) rules
   iptables -X; # delete all extra chains