Linux Network Packet Capture and Protocol Analysis: A Practical Troubleshooting Guide from tcpdump to Wireshark
Overview 2 AM. Your phone rings. The order system is timing out across the board — CPU is fine, memory is fine, disk I/O is fine. Restarting services does nothing. Rolling back does nothing. You stare at the dashboard; every metric is green. Only the users are screaming. Nine times out of ten, it is a network-layer problem. And what you need is a pair of eyes that can actually see the packets....