Нет, микротик посылает запрос радиусу с пустым паролем.
а микротик посылает потом alive пакеты или нет? или только 1 раз авторизовался и все?
по умолчанию именно второй случай. реально больше ничего и не нужно. формат имени пользователя (мак адрес) можно настраивать. другие фичи типа keep-alive (accounting) тоже можно включить:
* radius-mac-authentication (yes or no; default value: no) : This property affects the way how access point processes clients that are not found in the access-list.
o no - allow or reject client authentication based on the value of default-authentication property of the wireless interface.
o yes - Query RADIUS server using MAC address of client as user name. With this setting the value of default-authentication has no effect.
* radius-mac-accounting (yes or no; default value: no) :
* radius-eap-accounting (yes or no; default value: no) :
* interim-update (time interval; default value: 0) : When RADIUS accounting is used, access point periodically sends accounting information updates to the RADIUS server. This property specifies default update interval that can be overridden by the RADIUS server using Acct-Interim-Interval attribute.
* radius-mac-format (one of XX:XX:XX:XX:XX:XX, XXXX:XXXX:XXXX, XXXXXX:XXXXXX, XX-XX-XX-XX-XX-XX, XXXXXX-XXXXXX, XXXXXXXXXXXX, XX XX XX XX XX XX; default value: XX:XX:XX:XX:XX:XX) : Controls how MAC address of the client is encoded by access point in the User-Name attribute of the MAC authentication and MAC accounting RADIUS requests.
* radius-mac-mode (one of as-username, as-username-and-password; default value: as-username) : By default access point uses empty password, when sending Access-Request during MAC authentication. When this property is set to as-username-and-password, access point will use the same value for User-Password attribute as for the User-Name attribute.
* radius-mac-caching (either disabled or time interval; default value: disabled) : If this value is set to time interval, the access point will cache RADIUS MAC authentication responses for specified time, and will not contact RADIUS server if matching cache entry already exists. Value disabled will disable cache, access point will always contact RADIUS server.