DHCP Server Leases - Problem with static IP

RouterOS General
1

Hi to everyone!
I’m new here and also new with routeros. Configuring for the first time my new Mikrotik hEX (RB750Gr3) was easy.
Not so assign a Static IP to my devices in my LAN netwrok.
To do this I followed two simple guides:

  1. How to change dhcp range
  2. DHCP Reservations
    I changed the DHCP range to “192.168.0.50 - 192.168.0.254” and I assigned to 6 devices the following IP:
    192.168.0.2
    192.168.0.3
    192.168.0.4
    …
    All is ok, but I can not do it for a single desktop pc (with Windows 10 Pro 64 bit).
    When I try to assign to it a static IP (192.168.0.4 and yes I’m sure is not assigned for another device) the machine can not obtain anymore the IP and can not connect to the LAN: the status in winbox changes continually by “bound” to “busy”.
    If I remove this entry in the Leases list, the pc obtain normally an IP and connect successfully to the LAN.
    Tried several times: with or without “Client ID”, with or without “Use Src. MAC address”, but no way…

What is wrong? Why only this pc?
I don’t know what to do anymore.

2

For the lack of better ideas, just to rule out some typo or similar mistake, let the PC get dynamic address, then select lease, click “Make Static” button, rewrite address to 192.168.0.4 and let the PC try again (either reboot, or just disconnecting and reconnecting the cable should work too).

3

Thank you for the answer!
After opening this thread, I noticed I had big problems with my connection.
To access the web I use a modem ADB DV2200 that was given to me by my provider.
I tried to use it in full bridge mode, but it did not work. Now I put it in the DMZ and the connection works again.
Now also the problem I had with the static ip described above no longer appears.
I don’t know how the connection problem could be related to LAN IP problem…