So a Mac, Windows PC, and Ubuntu box walk into a bar and plug themselves into an Ethernet hub. And that's the end of the joke. From that point onwards, without any configuration necessary, all three computers should be able to network with each other. This is because, in the absence of a DHCP/DNS server to assign network addresses, all the computers will default to the Zerconf system (known as Bonjour on Apple Macs and Automatic Private IP Addressing on Windows; sometimes it's also known as link-local). The machines will sort themselves out with an IP address somewhere in 169.254 range (assuming all the computers are set to use IPv4 by default, which is very likely).
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