1
There’s more than one way to write an IP address (2019)
There's more than one way to write an IP address: decimal, hex, octal, overflowed octets and omitted zeroes all resolve to the same host. A fun trick to mess …
Mattias Geniar
Mattias Geniar, co-founder of Oh Dear. A decade of writing on Linux, PHP, DevOps, web performance, security and the open web, plus talks and projects.
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Visit ma.ttias.be → RSS feedOn Hacker News Jan 2015 – Jan 2026
Web & Frontend 9Security & Privacy 5Networking & Internet 4Software Engineering 3Infrastructure & DevOps 3Systems & Performance 2
2
Google’s QUIC protocol: moving the web from TCP to UDP
QUIC replaces TCP with UDP for faster connections, eliminating head-of-line blocking and reducing latency. Learn how it works and why it matters.
3
The text adventure game of exiting a Telnet session
We've all been there, right? You debug something, you try telnet to see if a port is open, and now you're stuck in a telnet session.
4
Google Chrome 51 disables HTTP/2 on most Linux distros due to old OpenSSL
Chrome drops NPN for ALPN on May 31st, requiring OpenSSL 1.0.2+. CentOS, Debian, and most Ubuntu versions can't support it, breaking HTTP/2 for millions.