I'm building networks with 256 devices that can't be pre configured (they all must start from the same configuration, it's not possible to give them static ip beforehand). Is there anyway from a managed switch or router (and if so what router type do i need to buy) to say something akin to "use DHCP, but once a device got an address once through DHCP, use that as a static ip for it's mac address every time it requests from dhpc again"?
Edit : it seems DHCP permanent allocation would work for my need, are all mid range routers (1/10GBs Netgear) expected to support this or do i need to look for it specifically?