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My home internet has felt a bit clunky for the last week. If I run nslookup on a site it seems to timeout about 1 out of every 5 times, while working fine the other attempts.

>nslookup www.google.com
DNS request timed out.
    timeout was 2 seconds.
Server:  UnKnown
Address:  8.8.8.8

Non-authoritative answer:
Name:    www.google.com
Addresses:  2607:f8b0:400a:80b::2004
          142.250.217.100
  • I'm having this problem on two different computers (both windows 10)
  • I tried without my router and connected directly to my modem and the problem persists. (I did a modem reset and that jazz.)
  • I've tried different DNS servers (my ISP, google and openDNS) and there's no change.
  • I've also tried rebooting, dns flushing, and some basic network reset commands.

What does work:

  • No problems when I Ping something.
  • If I enable my VPN nslookup works fine.

I want to say it's an issue with my ISP but that might be jumping to conclusions. Does anyone have an ideas of what might be going on, or what else I should do to troubleshoot?

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  • Can you do some packet loss measurement, both to the DNS servers and to various other sites in general? ping -t 8.8.8.8 and waiting a few minutes to collect some stats would be a good start.
    – grawity_u1686
    Commented Oct 15, 2021 at 7:07
  • Also, can you get a response out of nslookup google.com 203.0.113.2 or 198.51.100.3? (This is to detect DNS interception by the ISP. Normally those addresses should not respond.)
    – grawity_u1686
    Commented Oct 15, 2021 at 7:10
  • Pinging 8.8.8.8 was fine; < 1% packet loss. I got no response from the fake DNS addresses you suggested (as expected)
    – Simon
    Commented Oct 16, 2021 at 17:44

1 Answer 1

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I think there is a problem with my ISP - I saw a forum post suggesting other people are having a similar issue.

I did a bit more testing myself. I used wireshark and found out that some of the DNS lookup requests are just not getting responses (regardless of the DNS server).

I've started a support ticket with my ISP and will probably just wait it out at this point.

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