IPNAT seems to affect network performance? of jails on lo0
(10.0.0.0/24) - why?
freebsd-questions at k-moeller.dk
Wed Jul 4 06:15:11 UTC 2012
I know that ssh does a reverse dns lookup of the ip you connect from -
no matter if its local or not.
On Tue, Jun 26, 2012 at 4:58 PM, Christopher J. Ruwe <cjr at cruwe.de> wrote:
> 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
>> freebsd-questions at freebsd.org mailing list
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>> "freebsd-questions-unsubscribe at freebsd.org"
> 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
Med Venlig Hilsen
Kalle R. Møller
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