DNS delay on first lookup, Ubuntu 19.10 but not earlier versions

[Colin Law]

On Tue, 31 Mar 2020 at 22:31, Chris Green <cl at isbd.net> wrote:
>
> On Tue, Mar 31, 2020 at 10:10:44PM +0100, Peter Flynn wrote:
> >
> > On 31/03/2020 21:26, Chris Green wrote:
> > > I have a small home LAN with dnsmasq running on a Raspberry Pi to
> > > provide DHCP and DNS services.  I have two systems running xubuntu 19.10
> > > and on these systems I see a 5 second delay the *first* time I look up
> > > the address of a local host.  Subsequent lookups are fast
> > > but if the system is idle for a long time (I haven't quite fathomed
> > > out how long) I see the 5 second delay again.
> >
> > I've had this many times and always assumed it's my ISP.
> >
> > Peter
> >
> Well not for LAN lookups, nothing goes outside my LAN in this case.

How does it resolve esprimo.zbmc.eu without going outside the network?

Colin