How monitoring works in practice: polling and checks, graphs and dashboards, logs, and what to watch on routers, switches and servers.
Network Monitoring, Uptime & Alerting
A green ping check only proves a kernel answered. What ICMP, TCP, HTTP and synthetic checks each catch, and a layered plan for one web service.
Continue reading Ping is not monitoring: ICMP, TCP and synthetic checks compared ›
Network Monitoring, SNMP & Protocols
One rsyslog server, one folder per device, logs you can grep at 2 a.m. Formats, severities, device settings, rotation and clocks for a small network.
Continue reading Syslog for small networks: collect, rotate and actually read your logs ›
SNMP & Protocols, Network Monitoring
What ifHCInOctets, ifInErrors and ifOutDiscards really count, how a rate is computed, and the worked math behind a graph that lies after a wrap.
Continue reading Interface counters explained: octets, errors, discards and the 32-bit wrap ›
Five minutes is a habit from the MRTG years. How to pick intervals per metric, with counter wrap math, burst examples and storage costs.
Continue reading How often should you poll? Choosing a polling interval ›
