Practical technology help for homes and small businesses, from someone who knows how to make it work. Based in Martinez, serving Contra Costa County.
Practical IT guides, cheatsheets, and references from Jeremiah Ellington, drawn from more than 20 years of IT work in public sector and higher education.
Topic
Routers, firewalls, switches, VLANs, and Wi-Fi that stays up.
Networking & Wi-Fi · Start here
How a dependable network fits together: routers vs. firewalls, switches, VLANs, Wi-Fi, PoE, guest networks, firewall rules, DNS, remote access, and monitoring, with plans for homes and small offices.
Networking & Wi-Fi
Work out any IPv4 subnet's network, broadcast and usable range without a chart: find the interesting octet, work out the increment, round down, and fill in zeros and 255s. With worked examples, /0, /31 and /32, and the mistakes to avoid.