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Unable to perform DNS queries over IPv6 from laptop

Ask Ubuntu Asked by Jay Schauer on November 11, 2021

I was trying to perform a DNS query over IPv6 from my laptop using dig, and it didn’t work. Here are the details:

ping6 google.com works fine

dig -6 google.com times out due to being unable to reach any servers

dig -6 @fd85:x:x::1 google.com works fine

dig -6 @2601:y:y:y::1 google.com also works fine

The last two requests are being made directly to my router where I am running dnsmasq.

I couldn’t figure out how to see what DNS servers are being sent to my laptop over DHCPv6, but on my phone it lists these three (set automatically):

192.168.1.1
fd85:x:x::1
2601:y:y:y::1

The reason why I am asking on this forum is because it appears to be a problem only for my laptop, since my phone correctly sees the DNSv6 servers.
I am running Ubuntu 20.04 and my network settings show the IPv6 method and DNS as ‘automatic’.

One Answer

Nevermind, this is because nothing is listening locally for dns requests over ipv6, see this github thread: https://github.com/systemd/systemd/issues/12159

Answered by Jay Schauer on November 11, 2021

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