I am wondering if end host can in some way send info in a special DHCP option that it wants to use a static (permanent) IP address? I am facing a situation when VirtualBox Guest (Windows OS) get IP address and it is set as static in the DHCP lease section in Mikrotik router. Nobody set it this way and it was a little surprise that this VirtualGuest has a static lease in the RouterOS.
Can someone clarify me how is this possible?
Actually there are two devices which act like this. The second one is DVD player which is also connected to this LAN segment. In the DHCP leases there are another IP addresses which act like static but nobody set it this way. Any other devices act like “D” which stand for dynamic.
Yes, this is possible when you have enabled bootp support and set it to issue static leases.
When the client asks for bootp instead of dhcp it will get a static lease (that is in the same table as dhcp leases).
When you don’t want that, you can set it to dynamic or disable bootp support.
Thank you pe1chl for your quick reply to my question. You are right. This is exactly the reason why these leases act like static. I just want to note that I have already do a investigation about this topic but I didn’t find any topic which would match my key words. So I tried to put my question here.