code: func iptablesFlush() error {
  	for _, af := range seesaw.AFs() {
  		for _, table := range []string{"filter", "mangle", "raw"} {
  			if err := iptablesRun(af, fmt.Sprintf("--flush -t %v", table)); err != nil {
  				return err
  			}
  		}
  	}
  	// NAT is IPv4-only until linux kernel version 3.7.
  	// TODO(angusc): Support IPv6 NAT.
  	if err := iptablesRun(seesaw.IPv4, "--flush -t nat"); err != nil {
  		return err
  	}
  	return nil
  }
docs: // iptablesFlush removes all IPv4 and IPv6 iptables rules.