I can't see GIFs
The network either works, or it doesn’t. The port’s open, or it’s not.
But what do you do when the network starts restricting traffic by file type?
This unusual problem has appeared repeatedly in my career, but almost nobody else has it.
What is the problem?
What is the network architecture?
How do you analyze this kind of problem?
Less well-known tools for testing
The final solution
Michael W Lucas has been a network administrator since 1995, and has worked on everything from T1 to frame relay to ATM to cross-country Ethernet.