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

[Chris Green]

On Tue, Mar 31, 2020 at 10:19:38PM +0100, Colin Law wrote:
> On Tue, 31 Mar 2020 at 21:28, Chris Green <cl at isbd.net> 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.
> 
> Do you see anything relevant in syslog at this time?
> I think I have seen something like this before.  I have pushed the
> problem into my subconscious and hope that when I wake up in the
> morning the memory will be recalled.  Or maybe not .....
> 
No, nothing of great relevance.  It only confirms what my tcpdump
output shows really.

-- 
Chris Green