Many IPS assigned to a single PC

RouterOS General
1

Hello, checking the DHCP rents on my microtik, I have discovered that the router dynamically assigns many ips to a single PC. This is a Windows server, and I have made a static IP based on the Mac address.

beyond that the server working well and with the Ip = 3 that I marked as static, I would like to know if this is normal or there may be something wrong with the router configuration.

The PC in this case is SERVER2012. You will find in the attached file that the first IP value is the static one that you had marked and the rest are the ones that I don’t know where they came from.

If I check all these dynamic ips and delete them, it appears again.

Thank you very much for your help.
Best regards
microtikLeases.jpg

2

To me it doesn’t seem to be a matter of ROS configuration. If you look closely at the leases, you’ll see that the DHCP client running on the W2012 machine uses a unique Client ID field when applying for each lease, which makes ROS’ DHCP server treat them independently, hence you end up with multiple leases. I have no idea what makes the W2012 machine act that way, though, except if it is some strange kind of DHCP relay. By pinging all of them you should be able to find out whether all of them remain in use or only the newest one responds, which should suggest whether it is a bug of W2012 or whether it does that on purpose.