blogs
Krebs on Security — krebsonsecurity.com — investigative security journalism.
Packet Pushers — packetpushers.net — real network engineering, no vendor fluff.
Ivan Pepelnjak — ipspace.net — deep, respected writing on routing and network design.
Daniel Miessler — danielmiessler.com — security writing with real personality.
The InterNetwork — internetwork.blog — one working network consultant writing plainly.
CERT-In — cert-in.org.in — authoritative India-specific threat advisories.
Julia Evans — jvns.ca — the clearest technical writer online.
Errata Security — blog.erratasec.com — opinionated, technically sharp.