IPNAT seems to affect network performance? of jails on lo0
(10.0.0.0/24) - why?
Christopher J. Ruwe
cjr at cruwe.de
Tue Jun 26 14:58:50 UTC 2012
On Mon, 25 Jun 2012 18:23:56 -0400
Robert Huff <roberthuff at rcn.com> wrote:
> Christopher J. Ruwe writes:
> > On a KVM virtualized host, I run FreeBSD 8.3-RELEASE-p3 and some
> > qjails, 8.3-RELEASE. The jails are connected all via lo0 on
> > 10.0.0.0.
> > While by the large working as expected, I have noticed one
> > pecularity I have failed to pinpoint: When launching processes
> > with some network interaction, like sshing into one of the jails
> > from the platform or launching emacs, the command spends ages (
> > ~(1-2) minutes) idling? (nothing happens) before becoming
> > interactive.
> If the number is very close to 90 seconds, my first guess
> would be you have a DNS problem.
> Robert Huff
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Thanks for the hint. It was DNS ... I have copied a resolv.conf into the
jails for future use, but did not enable NAT from the start.
The issue disappeared when I commented out the nameserver entries and
switched NAT off again, i.e., I could login using ssh in a matter of
seconds, not minutes.
Now to the followup: Why does ssh and emacs! require DNS for entirely local
connections or just to be started?
Anyway, thanks for that hint, cheers,
TZ: GMT + 2h
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