anchor.diff:  
   otp16649_cases() ->
       [
  +     {group, otp16649_ipv4},
  +     {group, otp16649_ipv6}
  +    ].
  +
  +otp16649_gen_cases() ->
  +    [
        otp16649_1,
        otp16649_2,
        otp16649_3,
  
positive.code:      otp16649_6,
       otp16649_7
      ].
     
  
  otp8395({init, Config}) when is_list(Config) ->
      ?DBG("otp8395(init) -> entry with"
  
negative.code: 
      AgentConfDir        = ?config(agent_conf_dir, Config),
      Vsns                = [v1,v2],
      TransportDomain     = ?config(tdomain, Config),
      F = fun({PortInfo, Kind}) ->
                  #{addr => {AgentIP, PortInfo}, kind => Kind};
             ({PortInfo, Kind, Opts}) ->
  