From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: NetworkManager instead of Wicd in =?utf-8?Q?=E2=80=98%desktop?=
	=?utf-8?Q?-services=E2=80=99=3F?=
Date: Sat, 05 Aug 2017 22:52:14 +0200
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In-Reply-To: <87k22mm4fx.fsf@vany.ca> (Adam Van Ymeren's message of "Wed, 02
	Aug 2017 10:26:10 -0400")
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To: Adam Van Ymeren <adam@vany.ca>
Cc: guix-devel <guix-devel@gnu.org>, Maxim Cournoyer <maxim.cournoyer@gmail.com>

Adam Van Ymeren <adam@vany.ca> skribis:

> Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:
>
>> ludo@gnu.org (Ludovic Court=C3=A8s) writes:
>>
>>> Maxim Cournoyer <maxim.cournoyer@gmail.com> skribis:
>>>
>>>> I've noticed the same (lack of DNS resolution) following a reboot for
>>>> some minutes and was also wondering what was causing this. I'm using
>>>> wicd as part of the %desktop-services, so that specific problem is
>>>> probably not related to NetworkManager.
>>>
>>> Our default nscd config caches lookup failures for 20 seconds by default
>>> (see =E2=80=98nscd-cache=E2=80=99 in the manual.)  So if you look up a =
host before
>>> networking is up, and it fails, then there=E2=80=99s a window during wh=
ich
>>> lookup will keep failing.
>>>
>>> I don=E2=80=99t know if that explains what you=E2=80=99re seeing.
>>
>> It can take much longer than 20 s upon a reboot to have the name
>> resolution working again (more than 5 minutes), so that doesn't seem to
>> explain it by itself.
>
> Most of the time I have to restart my applications like icecat of emacs
> when my network settings change.  I'm using wpa_supplicant and dhclient
> by hand rather than wicd.
>
> Something somewhere is caching network information longer than it should
> be.

Could you try after running =E2=80=9Csudo herd stop nscd=E2=80=9D?

nscd caches host name lookups, so if you switch, say, to a captive
portal, you have to turn nscd off.

Ludo=E2=80=99.