Static DHCP get lost in backup/restore

RouterOS General
1

Running RB4011iGS+5HacQ2HnD / 7.23.2 (stable)

If I change a DHCP lease from dynamic to static and then run a backup/restore cycle, the lease reverts to dynamic.

Is this normal? I wanted the lease to remain static through a backup/restore.

Jim

2

You are restoring config, so the configuration will reflect how it was backed up.
Exactly like it was when the backup was made.

So your backup was made with a dynamic lease setting.

Look at it from another angle:
if you make a copy on a xerox machine, you do expect the result which comes out to be exactly the same, yes ?
That's what backup/restore does ...

3

Just to be clear, here is the flow:

step 1: set lease to static - verify from winbox, set as static

step 2: backup the router into file "abc"

step 3: restore the router from "abc"

Now the lease has reverted to dynamic.

Jim

4

OK, I see ... you're talking about client lease settings.
I think (but could be wrong) those lease settings are not part of config, purely RAM.
So they are not backed up then ?

Let's see if others can chime in acknowledging this or provide a more accurate response.

EDIT: just checked on my RB5009 since I also use static leases quite often.
They are visible in export. So they should be part of backup then ??
Strange...

5

The static lease is bound to client's MAC address.

So if a client is configured to present a randomized MAC, the DHCP server will always see it as a new device, and the static lease configured earlier will not be applied. As a result, the client will receive dynamic lease every time.

In other words, the issue is likely with the client, not the DHCP server.