IP addresses 172.17.x.x cannot be reached from outside our network, and that's how it's supposed to work, right? I'm in a nasty argument with one of my customers, and one of us is acting like a total ...

Are you familiar with the concept of an IP address? If you’re not sure what the term means, it’s still highly likely that you’ve seen an IP address before. You’ve probably stumbled upon a string of ...