Random domain name resolution errors

Random domain name resolution errors

[Pierre Neidhardt]

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Hi!

A strange thing just happened to me: ever since I went to Belgium last
week (don't know if it's relevant) I keep getting domain name resolution
errors.

For instance right now duckduckgo.com fails but guix.gnu.org works.

I'm back home now and the issue persists.

Any clue how to investigate?

Cheers!

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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Re: Random domain name resolution errors

[Jelle Licht]

Pierre Neidhardt <mail@ambrevar.xyz> writes:

> Hi!
>
> A strange thing just happened to me: ever since I went to Belgium last
> week (don't know if it's relevant) I keep getting domain name resolution
> errors.

>
> For instance right now duckduckgo.com fails but guix.gnu.org works.
>
> I'm back home now and the issue persists.
>
> Any clue how to investigate?

When I have *some* domain name resolution issues, it usually has
something to do with my nscd being a bit too eager caching negative
results. Assuming you are using Guix System, does `herd invalidate nscd
hosts' help?

  - Jelle

Re: Random domain name resolution errors

[Pierre Neidhardt]

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Yes, on Guix system.
I just run your suggestion, I'll report tomorrow if it fixes the issue
for good.

Do you have to run this often?

Cheers!

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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Re: Random domain name resolution errors

[Julien Lepiller]

Le 7 février 2020 08:36:54 GMT-05:00, Jelle Licht <jlicht@fsfe.org> a écrit :
>Pierre Neidhardt <mail@ambrevar.xyz> writes:
>
>> Hi!
>>
>> A strange thing just happened to me: ever since I went to Belgium
>last
>> week (don't know if it's relevant) I keep getting domain name
>resolution
>> errors.
>
>>
>> For instance right now duckduckgo.com fails but guix.gnu.org works.
>>
>> I'm back home now and the issue persists.
>>
>> Any clue how to investigate?
>
>When I have *some* domain name resolution issues, it usually has
>something to do with my nscd being a bit too eager caching negative
>results. Assuming you are using Guix System, does `herd invalidate nscd
>hosts' help?
>
>  - Jelle

Just had this issue yesterday on an unreliable network. Thanks for that command :)

Re: Random domain name resolution errors

[Pierre Neidhardt]

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OK, the error just occurred.  I tried to run the command again but it
hung.
I restarted the service, see if that helps.

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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Re: Random domain name resolution errors

[Pierre Neidhardt]

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Sorry, forgot to follow up with this thread.  Jelle's trick did work for
me.

The issue happens most of the times when I travel.
Should we consider this a bug?  Can we do something to fix it?

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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Re: Random domain name resolution errors

[Leo Famulari]

On Sat, Mar 14, 2020 at 03:59:26PM +0100, Pierre Neidhardt wrote:
> Sorry, forgot to follow up with this thread.  Jelle's trick did work for
> me.
> 
> The issue happens most of the times when I travel.
> Should we consider this a bug?  Can we do something to fix it?

I consider it a bug, please feel free to open a ticket.

Re: Random domain name resolution errors

[Pierre Neidhardt]

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Done, see 40062@debbugs.gnu.org.

Thanks!

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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