Why and how you should run your own DNS resolver

Recently I noticed I was still using Google's DNS server, 8.8.8.8. This is bad because it means Goog...

IPv6 for GitHub

Every time Hacker News discusses IPv6 someone mentions that GitHub is commonly cited as one of the l...

Fixing a problem with email source IP addresses

I recently encountered a problem sending email to a domain that uses Google mail. Thankfully I got a...

Why do we need MAC addresses?

Everyone who's ever looked into computer networks in detail has asked, at some point in their life,...