Re: kernel-4.13.5-200.fc26.x86_64 DNS slowdown?

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On 10/12/17 06:08, Patrick O'Callaghan wrote:
> I know what DDNS is. That's not what I'm talking about. I'm not using
> DDNS at present though I have done in the past. The router has a
> control panel for configuring *its own* DNS resolver, i.e. where it
> forwards queries to upstream. It was set to "dynamic", which I
> interpret to mean "get the configuration from the ISP". (The broadband
> connection is PPPoE so it presumably behaves like an Ethernet).
> Changing it to explicitly point at Google is what had the desired
> effect. It now seems likely that the kernel version was mere
> coincidence, at least I hope so.

It was 05:45 and still dark out.  Forgot who I was talking with.  Sorry about that.

>
>> So, in your configuration it sounds like your Fedora system is getting all the
>> network configuration from your router.  So, if you look in /etc/resolv.conf you see
>> the IP address of your router?  Yes?
> Correct.
>
>>> I don't see how a change of kernel could have affected this, unless
>>> there's some subtlety in uPnP (or DHCP), but we'll see.
>>>
>>>
>> I don't think you're seeing any kernel issues.
> As I say, that may well be the case (I hope it is). The router config
> change seems to have corrected the problem for now.


Would have been nice know what resolver the router was using when set to Dynamic.....


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