Let’s see if I got this… great idea to disable DHCP on the new OPNSense for now. I forgot about that. Just keep the one LAN cable going in, and I will just keep the IP address as it is right now (.79). Not even worry about the WAN port at all. Set up all of the features, including things like reserved IP addresses and whatnot. Then, when I am ready to drop it in, I will turn the old router off, and on the new router set up a static IP on the LAN port (.0.1) and add the WAN port (DHCP). Drop it in place, turn on DHCP and I’ll be good to go.
Yeah, but I’d rather not change it because I am pretty sure there are some devices in the house where I set up static IP addresses. I try not to do that, but over the years, I am pretty sure there are at least a couple. Heh, maybe a good time to seek them out!