c6108ba2__de_Administración_del_Sistema__Descripción
[Opciones] allow-update [Descripción] 
Specifies which hosts are allowed to dynamically update information in their zone. The default option is to deny all dynamic update requests. Note that you should be careful when allowing hosts to update information about their zone. Do not set IP addresses in this option unless the server is in the trusted network. Instead, use TSIG key as described in Sección 12.2.5.3, “Transaction SIGnatures (TSIG)”.
Guía de Administración del Sistema
Descripción