anchor.diff:                                         | {cannot_listen, inet:posix()}
                                          | {address_not_allowed, string()}.
   is_good_address(Address) ->
  -    is_good_address(Address, misc:get_env_default(ns_server, ipv6, false)).
  +    is_good_address(Address, misc:is_ipv6()).
   
   is_good_address(Address, false) ->
       check_short_name(Address, ".");
  
positive.code: 
  -spec localhost([] | [url]) -> string().
  localhost(Options) ->
      case get_env_default(ns_server, ipv6, false) of
          true ->
              case Options of
                  [] ->
  
negative.code: 
  -spec get_proto_dist_type() -> string().
  get_proto_dist_type() ->
      case misc:is_ipv6() of
          true ->
              "inet6_tcp";
          false ->
  