Date: Wed, 4 Jul 2012 08:15:10 +0200 From: =?UTF-8?Q?Kalle_M=C3=B8ller?= <freebsd-questions@k-moeller.dk> To: "Christopher J. Ruwe" <cjr@cruwe.de> Cc: freebsd-questions@freebsd.org Subject: Re: IPNAT seems to affect network performance? of jails on lo0 (10.0.0.0/24) - why? Message-ID: <CAMaK76HzQziMEVhQSrjSk8mV8v6gxRpR5OLLcKb=rEcNv7HjFw@mail.gmail.com> In-Reply-To: <20120626165825.000ff9d5@dijkstra.cruwe.de> References: <20120625221711.7aec82b8@dijkstra.cruwe.de> <20456.58620.356372.475182@jerusalem.litteratus.org> <20120626165825.000ff9d5@dijkstra.cruwe.de>
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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@cruwe.de> wrote: > On Mon, 25 Jun 2012 18:23:56 -0400 > Robert Huff <roberthuff@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@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-questions >> To unsubscribe, send any mail to >> "freebsd-questions-unsubscribe@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 loc= al > connections or just to be started? > > Anyway, thanks for that hint, cheers, > -- > Christopher > TZ: GMT + 2h --=20 Med Venlig Hilsen Kalle R. M=C3=B8ller
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