DHCP client reservation

[anode]

I keep all my devices on my LAN held to a DHCP reservations.  (its like static IPs assigned from a central location.  And makes finding rouge devices easier)

My Tetra (and probably the nano, and mkV and mkIVs )  won't accept the reservation IP of the DHCP server (Synology NAS is dolling out the IPs)

It keeps using the last IP it had.  The DHCP server is using a rather short lease time (5 minutes)  Most, but not all devices, react correctly to this and get the assigned/reserved IP.

So my Q is what file do I gotta twiddle/delete to get the Tetra to get the new/correct IP?  (turning the Tetra on after the lease time expired does not work)

TAI