This is a public service announcement:
If ever your local hell desk people come to you, the owner of the only Mac on the entire network and ask you to fiddle around with ipconfig from the commandline to get a new IP adress (because the DHCP server has assigned you the IP adress of a printer) just smile, back away gently and open System Preferences > Network. Change the pop-up at Configure from "Using DHCP" to another item and switch back to receive a new IP adress.
Sometimes things are simple.
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