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I saw a clever little tool on LinkedIn the other week. Someone had written a "ping" in Go that fired HTTP requests instead of ICMP echoes. I sent it over to Zain and we both agreed the idea was great. But writing it in Go felt like a lot of effort for what is, at heart, a loop around curl. So I wrote a Bash version in about ten minutes. Then I wrote one for DNS. Then one for NTP. They all live here now: @simonpainter/network-tools.
This is here primarily as a reminder to me; a note for when I need this again. You may already know this or you may find this useful to learn this.
A little while ago I set out to find a way to measure the overhead that FQDN filtering places on HTTPS web traffic. I've shared the results here, but I thought I'd take the opportunity to discuss the methodology in a bit more detail.
I was chatting with a friend who's studying for his AZ-700 exam, and he showed me this rather neat way of finding your IP address using Google DNS.