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Things you don't expect to see when setting up a new customer's high-speed Internet service:
A long-forgotten & disconnected DSL modem at the end of 100s of feet of ethernet cable, next building over, still turned on, & still handing out its own DHCP leases to nowhere on the new wifi.
Of course, it didn't work.
The thing is, it never worked, & the non-DSL ISP they switched to me from never bothered to troubleshoot past the router's Internet port or otherwise make sure their customer could actually use the Internet service they were paying for.
I did, & I now have another happy customer. But this network mess today drained me.