In general DHCP works fine on both RV042 184.108.40.206-tm and RV082 2.0.2.01-tm. But in some cases an automaticaly created DHCP lease remains permanently in the router memory. If it happens the problematic DHCP lease entry does not allow to move the device to any other IP, as the static DHCP function does not work for this MAC, any more. In case a new lease is created, an entry appears in the DHCP - Status list. Such an entry shows host name, MAC and IP. When the IP is released the entry disappears. When the permanent entry phenomenon happens, every DHCP query with a certain MAC brings back an old record with stored host name. I mean, when a computer with the same MAC, but different host name requests for a DGCP lease, the entry appears with the old host name and IP, no matter what the current computer host name is. In the same time the entry in DHCP static IP is not taken into consideration. The computer with this particular MAC always gets the same old IP (even if the IP is outside of the DHCP server dynamic IP range). In the same time, DHCP leases of all other computers are working correctly. I tried: - to reboot the router - to release and then renew the lease - to delete the lease from the DHCP - Status list - to set a static DHCP rule - to change the DHCP server dynamic IP range - to move the saved config file to another RV042 router nothing seems to be working. It appears the permanent lease entry is kept in the router flash config file, and gest tranferred with it to other devices. I'm out of ideas at the moment. But, I refuse to just to bring the router config back to the factory settings, and then to reenter all the settings.