Every tutorial filed under troubleshooting, newest first.
How to read ping, traceroute and mtr output on Linux: packet loss, jitter, path MTU with ping -M do, why traceroute asterisks are often a false alarm, and a real troubleshooting workflow on Ubuntu 24.04 and RHEL 9.
Continue Reading →A bottom-up method for Linux network troubleshooting: link and ARP, routing, then a live demo of refused versus firewall-filtered connections, then DNS. Real output on Ubuntu 24.04 and RHEL 9.
Continue Reading →Monitor Linux CPU, memory, disk and network with top, vmstat, iostat, sar and PSI, tested under real load to show what a real bottleneck looks like.
Continue Reading →
