Strange behavior of the dhcp server on mikrotik, how to fix it?

Question

DHCP

In general, the situation is like this. DHCP server and NAT on RB750GL, latest stable firmware. The device (specifically, this is a mobile phone, but the situation is the same with others) connects via wi-fi (RB2011UAS, ports in the bridge, only distributes wi-fi), does not receive ip, disconnects, tries to connect again, disconnects again, and so on until then pores until it connects. Usually within a couple of minutes. This does not always happen, periods and with different devices. During these "jumps" with dhcp, other clients work fine.

On the screen cut off the MAC address of the device.

Answer 1

Solution:
Unchecked the "Use framed as classless" dhcp server settings, which appeared spontaneously after some of the RouterOS updates

Answer 2

You should post the result of the export command. Screenshots are a convenience.

Answer 3

1. Make sure that the ip address and dhcp server of Mikrotik is assigned to the bridge
2. Make sure that there are no other dhcp servers on the same subnet
3. Check the air noise.
4. If the first three points did not help and the problem remains, then do / export file = mycfg, save the file to the computer, and then reflash the Mikrotik via netinstall. After that, load the configuration via /import file=mycfg

Answer 4

Мои настройки Wi-Fi:
Настройка бриджа

Answer 5

Mikrotik так себя ведёт когда есть фильтр по МАК адресам. Проверьте есть ли он и есть ли в нем ваше клиентское устройство

Answer 6

Сколько клиентов в сети? Была проблема когда в пуле было много устройств с статикой (т. Е. В сети есть устройство с ip входящим в пул у которого этот адрес назначен статичтически на самом устройстве, но не в dhcp сервере). И dhcp (или клиент) не получали этот адрес, но пытались.

Answer 7

Так ведут себя айфоны, отключают wi-fi модуль в целях энергосбережения.