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robomc | 1 year ago

I have a silly question I guess... why does it print everything out twice?

~ doggo google.com

NAME TYPE CLASS TTL ADDRESS NAMESERVER

google.com. A IN 296s 142.250.67.14 127.0.2.2:53

google.com. A IN 296s 142.250.67.14 127.0.2.3:53

~ doggo news.ycombinator.com

NAME TYPE CLASS TTL ADDRESS NAMESERVER

news.ycombinator.com. A IN 1s 209.216.230.207 127.0.2.2:53

news.ycombinator.com. A IN 1s 209.216.230.207 127.0.2.3:53

discuss

kadoban|1 year ago

Looks like once per nameserver that you're configured to use. I guess just in case they give different answers, which is uncommon in practice.

vladvasiliu|1 year ago

Oh man, if I had a penny for every time this issue came up, my grandchildren wouldn't have to work a day in their lives.

mrngm|1 year ago

Try a few queries to an anycasted resolver for the same record. It's rather common that, for example, TTL values differ per response. (the magic trick here is that it's not guaranteed that your requests end up on the same resolver).

You could have a look at https://dnsdiag.org/ that provides a few tools for further introspection in the many (different) answers resolvers can give.

ksynwa|1 year ago

Would be useful in my unfortunate case where the ISP's DNS is broken for a bunch of domains. Most notably githubusercontent.com. Also a bunch of CDN domains.

mr-karan|1 year ago

Just tried on my Adguard DNS server, I am only getting one entry. I think it's related to your nameserver configuration. Could you try reproducing with specifying a custom one, with @1.1.1.1 or something?

  doggo google.com --short
  142.250.185.238