No, you can do a "reserve" for any IP address that's either (a) not currently in use, or (b) currently in use by the device you want to assign it to. The low/high range for DHCP dynamic assignments limits what the router can assign, but address reservation if not prevented from gobbling up any one or more of those addresses within the DHCP range. They will simply be "reserved" for a known MAC address/device, and not dynamically given out to some other device even though they are inside of the specified low/high DHCP range.
I don't follow what you're saying. 192.168.200.1 is the IP address of the ETH tuner or PCIe card, and the address you'd place in the URL address of a browser in order to "talk to the card". The tuners have their own address which is 192.168.200.2 (for all 4/6 of them, somehow), which is shown on the "tuner" tab for each of the tuners. In my understanding, the "card" is like a "router for the tuners".That said, it's a wise approach I've employed (with a permanent lease) on my network for years, as it's easier to recover a device already configured to get its IP via DHCP. The default '192.168.200.2' is intended, IIRC, as a fail-safe when nothing else works.
These addresses have nothing to do with the real LAN network router, e.g. my 192.168.1.1, as well as all the rest of network devices connected wired or wireless and which get an IP address of 192.168.2-254, either via DHCP or manual static IP reservation/assignment.
Reasonable idea. Why not give it a try? The drivers should be able to figure it all out.If the network config is in question, the Ceton Diags tool has a 'Reset Network' radio button on the 'Devices' tab to set everything back to factory defaults. I'm undecided on whether it'd have any bearing on the problem, but in the absence of alternatives, WTF? Just reboot the ETH6 after the reset.