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

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On Thu, 2017-10-12 at 07:08 +0800, Ed Greshko wrote:
> 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.

No worries. Hope I didn't sound snappy, which wasn't my intention.

> > > 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.....

Probably the ISPs own server, but there's no easy way to know and by
this time they've probably corrected any problem they may have had.

poc
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