Documentation, IPAM, diagrams, tooling habits and the odds and ends of running a network.
Netmask, wildcard, total and usable addresses for every prefix from /8 to /32, plus the block-size trick, /31 and /32 links and the private ranges.
Continue reading Subnet cheat sheet: every prefix from /8 to /32 in one table ›
What to write down about your network, when a spreadsheet stops being enough, how to draw useful diagrams, and how to keep it all true.
Continue reading Documenting your network: diagrams, IPAM and the spreadsheet that will not die ›
A good runbook is the calm colleague who is awake when you are not. A six-part template, writing tips, and a full example for a core uplink.
Continue reading Runbooks an on-call engineer can use at 3 a.m. ›
