I've have had a Billion 7800 router for years. It's been great, and worked very well.
I add static IP addresses in Advanced > Configuration > LAN > DHCP Server > Fixed Host
And I use the 192.168.0.x range.
On the devices themselves, I've tended to leave them set to auto/DHCP, and the router assigns the correct IP based on the MAC address that I've assigned.
I have the DHCP server set from 192.168.0.120 to 192.168.0.200. That takes care of mobile phones and anything that I'm not bothered about having a static IP address for.
A couple of nights ago, I added a new static IP address, for a mini PC (Odroid N2+, attached to projector). I thought that this already had a static IP, but noticed that it hadn't, so I set one.
As far as I can remember, I'm sure that I didn't change anything else on the router!
I noticed that I also had to set the IP settings on the mini PC. No problem, but I don't usually have to do that.
Since then, the whole network has been falling down!
The linux server went first, which I fixed by adding it's own static IP address into the settings (turning auto/DHCP off).
Then the Windows 10 boxes started dropping like flies.
After searching online, I've been using this to fix them ...
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netsh interface ip set address name="Ethernet" static 192.168.0.x 255.255.255.0 192.168.0.xxx netsh interface ip set dns name="Ethernet" static 192.168.0.xxx
Then there's mobile phones. They just aren't working at all.
They seem to be trying to connect with 169.254.xxx.xxx addresses. Why on earth are they doing that?
The DHCP settings, in the router, seem fine. I've even compared them with screenshots, of the same screen, taken a few years ago (with the network in it's previously working state).
Any idea what could be going on?