Strange DNS query name every few seconds

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Chakpak-4015 asked Oct 17, '21 DSPatrick commented Oct 29, '21

Strange DNS query name every few seconds

I recently looked at DNS query log on my router and see that my Windows machine is issuing a DNS query to npifea0ab.lan (basically some "random" looking characters followed by .lan) all the time. Mostly every 5 seconds but sometimes a second apart or 6 seconds apart.

The router doesn't resolve with an IP address but seems to return NXDOMAIN. I assume that such a flurry of DNS requests can't be good and wondering where are they coming from? I restarted the laptop and didn't open any browser so there are no tabs in there to ask for DNS. What is Windows doing? How to make progress debugging root cause?

windows-dhcp-dns

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Answer 1 · 2021-10-17T15:31:22.093Z

DSPatrick answered Oct 17, '21 DSPatrick commented Oct 19, '21

Sounds like your router provides the private domain space named LAN. Might need to read up on the router or follow-up in forums for the router hardware. Something here may also help.
https://homenetworkguy.com/how-to/use-custom-domain-name-in-internal-network/

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DSPatrick · Oct 19, 2021 at 02:04 PM

Just checking if there's any progress or updates?

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Answer 2 · 2021-10-21T18:31:21.457Z

Chakpak-4015 answered Oct 21, '21

I wrote router but truly it isn't router. It is a Pi-Hole that is monitoring the web traffic and that reported this access from my laptop.

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Answer 3 · 2021-10-21T18:34:06.6Z

DSPatrick answered Oct 21, '21 DSPatrick commented Oct 29, '21

Sounds good, I'd try getting in touch with the "Pi-Hole" support team to debug.

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DSPatrick · Oct 29, 2021 at 01:03 PM

Just checking if there's any progress or updates?

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