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devnonsense.com

Taking things apart and putting them back together. Old software. Memories.

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Visit devnonsense.com → RSS feedOn Hacker News Sep 2023 – Mar 2024

Systems & Performance 2Networking & Internet 2

1

How does Linux NAT a ping?

A few months ago, I found myself wondering how a command like ping 1.1.1.1 works from within a private network. In most private networks, multiple hosts connect to the Internet through a router. For IPv4, the router performs network address translation (NAT) by rewriting the original host’s source address to the…

2

TCP connection timeout mystery

For over a year, I’ve been investigating a strange issue with the internet in my apartment. I’m posting the details here in case someone more knowledgeable than me can solve the mystery. I live in graduate student housing with internet provided by the university campus. Usually things work reasonably well, with one…