"My Pi *is* going to be the router"I have and they're not correct in what they're asking for. If you run ANY DHCP server (on a router or on a Raspberry Pi) it is ALWAYS much better to define the static IP addresses on the DHCP server based on the MAC address they're presenting (regardless of how those MAC addresses are set). It is MUCH more efficient to have everything in one place and a single list of IP address vs MAC address.(re)read the OP
The way I interpret it: that Pi has 2 ethernet interfaces; 'WAN' which gets its IP allocated from uplink/ISP via a DHCP client and 'LAN' with a fixed/static IP address set by @l0ci. The latter is what this topic is about as I read it. Might be totally different, I don't know.
And likely that Pi will run a DHCP server that issues IP addresses to downlink/LAN clients for which using MAC-address to mapped to static IP address is good practice as you write. But that is not the topic question.
Statistics: Posted by redvli — Mon Dec 08, 2025 12:34 pm