how to reset iptables

• Reset iptables(IPV4):

    # set default policies to allow everything
    sudo /sbin/iptables --policy INPUT   ACCEPT
    sudo /sbin/iptables --policy OUTPUT  ACCEPT
    sudo /sbin/iptables --policy FORWARD ACCEPT
  
    # flush rules
    sudo /sbin/iptables -F
  
    # delete all user defined chains
    sudo /sbin/iptables -X
  
    # zero counters
    sudo /sbin/iptables -Z
  
    # reset all the tables
    for table in filter nat mangle; do
      sudo /sbin/iptables -t $table -F
      sudo /sbin/iptables -t $table -X
      sudo /sbin/iptables -t $table -Z
    done
  

• Reset ip6tables(IPV6):

    # set default policies to allow everything
    sudo /sbin/ip6tables --policy INPUT   ACCEPT
    sudo /sbin/ip6tables --policy OUTPUT  ACCEPT
    sudo /sbin/ip6tables --policy FORWARD ACCEPT
  
    # flush rules
    sudo /sbin/ip6tables -F
  
    # delete all user defined chains
    sudo /sbin/ip6tables -X
  
    # zero counters
    sudo /sbin/ip6tables -Z
  
    # reset all the tables
    for table in filter mangle; do
      sudo /sbin/ip6tables -t $table -F
      sudo /sbin/ip6tables -t $table -X
      sudo /sbin/ip6tables -t $table -Z
    done