@PavelV 

I had a similar problem that a device wouldn't accept its fixed IP address. May not be of any help but worth considering. Bit of a timeline to explain what had happened:

Device 1 - Remove fixed IP (192.168.0.20)

Device 1 - Unplug

Device 2 - Plugin (gets assigned DHCP IP 192.168.0.111)

Device 2 - Assign fixed IP (192.168.0.20)

Device 2 - Reboot

Device 2 - Still assigned to DHCP IP of 192.168.0.111

No matter how many times i refreshed the IP on Device 2 it didnt work. I even left it 24hours and still no joy. The solution was to unplug Device 2, plug device 1 back in and make sure it gets another IP address allocated to it. Then i plugged device 1 back in and it worked.

So what i should have done is:

Device 1 - Remove fixed IP (192.168.0.20)

Device 1 - Reboot

Device 1 - Gets assigned (192.168.0.40)

Device 1 - Unplug

Device 2 - Plugin (gets assigned DHCP IP(192.168.0.111)

Device 2 - Assign static IP (192.168.0.20)

Device 2 - Reboot

Device 2 - Now has Static IP 192.168.0.20

you guys are doing this really wrong

what a proper DHCP workflow is

device (your IP cam etc) online -> device talk to DHCP(this will most likely on your router) and ask for IP assignment -> DHCP assign proper IP back to device -> device on net

what you guys are doing

device (your IP cam etc) online -> device talk to DHCP and say "hey my IP is 192.168.0.20" -> DHCP confused because it never assigned this IP out to this device, or worst case, this IP is in already use by another device on net -> DHCP probably decide to ignore the device self assigned IP and assign a proper one -> device on net with a different IP

so 99% of the chance, you do not want to assign a fixed IP on OC200 to your device and try to fool the DHCP server on your router

instead you should set a static assignment on your router's DHCP table so your device will always get a static IP through it!!

@Fae 

Hello,

my router is TL-R605

@Fae 

I'm using an R605.