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DHCP is what I would suggest. It’s a pain to assign static IP addresses, and not even very effective from a security standpoint. However, DHCP doesn’t always work well with everything. I’m specifically thinking of networked printers, although a few will work with DHCP...it’s very hit or miss, mostly miss in my experience. The problem is that other machines on the network (usually) can’t find the printer when its IP changes.