Show HN: DNS Benchmark Tool – Compare and monitor resolvers (github.com)

Very neat tool!

You are, presumably, already familiar with the ISC Looking Glass?

https://isc.sans.edu/api/dnslookup/google.com

The Spinrite guy was the first to do this (I think). https://www.grc.com/dns/benchmark.htm

That said, more options are good. I'll give this one a go.

Here's my take. Ads will happily eat 300ms per webpage if you allow them to load. A fast DNS is great, but an adblocking DNS will save you much more time if you're just browsing.

https://github.com/farrokhi/dnsdiag is another great toolbox for looking into DNS problems.

Things built with asyncio and dnspython are close to my heart. ;-)

So, my impression from the doc (and a quick browse of the code) is that this is a tool for monitoring DNS caching / recursing resolver (RD) performance, not authoritative. If performance really matters to you, you should be running your own resolver(s). [0] Granted, you will quickly realize that some outfits running auth servers seem to understand that they're dependent on caching / recursing resolvers, and some are oblivious. Large public servers (recursing and auth) tend to "spread the pain" and so most people don't feel the bumps; but when they fall over they fall over large, and they bring some principles (and thereby create "vulnerabilities") at odds with what the DNS was architected for and throw the mitigation on the other operators, including operators who never accepted these self-anointed principles to begin with.

I have a hard time understanding how DNS is adding 300ms to every one of your API requests... unless DNS is both the API and transport, or you're using negative TTLs /s.

Good doc, by the way.

[0] Actual resolvers. Not forwarders.

is this similar to the GRC tool?

If you want to run python tools without installing them:

    uvx --from dns-benchmark-tool dns-benchmark top

Need a docker image if you would, thanks.