On 29-04-2021 22:11, Hendrik Boom wrote:
> On Mon, Apr 26, 2021 at 12:53:53PM -0700, Rick Moen wrote:
>> Quoting Hendrik Boom (hendrik@???):
>>
>>> Looks as if the connection manager is taking over dns.
>>>
>>> Who knew? And whom does it talk to? Does it contain its own recursive
>>> DNS resolver? Or does it just pick up on the DHCP signals it gets from
>>> elsewhere and take over?
>> connman (which I don't use, and have only read about) does _not_ appear
>> to include a recursive nameserver.
>> https://launchpad.net/connman
>>
>> The data you've posted so far that I've read in this thread (but I
>> haven't caught up with the full thread, yet) seem bizarre, in suggesting
>> that connman itself is hogging port 53 on localhost -- which would
>> definitely mean either it's handling any recursive requests or nothing
>> is.
>>
>> I'd have been extremely surprised if any connection management utility
>> had an integral recursive nameserver. The latter are complicated
>> projects, which is why there have been relatively few successful ones.
> It would surprise me, too.
>
> My guess is that it gets the DHCP information and does nothing but
> relay DNS requests to the DHCP-indicated nameserver.
>
> The problem I'm having is that sometimes the network anager seems to fail
> in some unclear fashion, and when it does so, even if it manages to
> re-establish connexions to the rest of the world, even through the same
> server, it doesn't always seem to be able to do name resolution afterward.
> So DNS requests fail.
>
> It might re-establish taht connection through a different hardware
> device on the laptop, by the way, such as switching between wired
> and wifi. Although all these connections lead to the same server
> with the same IP number.
>
> To keep tings running, I hand-edit /etc/resolv.conf to point to an
> easily remembered nameserver, such as 8.8.8.8.
>
> Of course that's clobbered next time I boot then machine.
>
> So I'm wondering -- can I stop the connectino manager from being
> obnoxious, or if I replace it, what to I replace it with?
>
> -- hendrik
>
> P.S. I seem to emember having a diffrent program setting up
> connections long ago on another machine. Might it have been
> called network manager? What such tools are available?
>
> If it weren't a single-user-at-a-time personal computer,
> having network setup be a user instead of system responsibility
> would be stupid. As it is, when I boot up in a strange place
> I might like some control as to what to connect to, so this
> stupid policy works out OK.
>
> -- hendrik
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I do have one stubborn laptop which has a similar behavior and to keep
it going i have entered the dns in /etc/resolv.conf and made the file
readonly. So far this works fine.

Grtz.

Nick