Finding an MTU Black Hole with ping, tcpdump and Wireshark
Why big transfers hang when ping works, and three ways to fix it
Joseph O'Shaughnessy
Hands-on networking from a working engineer. Practical labs, packet captures and troubleshooting walkthroughs on Linux, Cisco, Juniper and Fortinet, all built and tested in my own home lab. Written for engineers who want to understand what’s actually happening on the wire, not just which commands to type.
