If you want to change the DNS server using Command Prompt or Windows PowerShell, this tutorial will be handy. Instead of opening the Network Connections window, you can follow this step-by-step guide ...
None of these 60 macs are getting their DNS info from a DHCP server? That's really the "correct" way to go about this. Change it once on the DHCP server and then they will all pick it up automatically ...
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