Date: Tue, 26 Jun 2012 16:58:25 +0200 From: "Christopher J. Ruwe" <cjr@cruwe.de> To: freebsd-questions@freebsd.org Subject: Re: IPNAT seems to affect network performance? of jails on lo0 (10.0.0.0/24) - why? Message-ID: <20120626165825.000ff9d5@dijkstra.cruwe.de> In-Reply-To: <20456.58620.356372.475182@jerusalem.litteratus.org> References: <20120625221711.7aec82b8@dijkstra.cruwe.de> <20456.58620.356372.475182@jerusalem.litteratus.org>
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--Sig_/5V+ODDXy6h7vGeQ/.V2=8dg Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Mon, 25 Jun 2012 18:23:56 -0400 Robert Huff <roberthuff@rcn.com> wrote: >=20 > Christopher J. Ruwe writes: >=20 > > 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. > > =20 > > 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. >=20 > If the number is very close to 90 seconds, my first guess > would be you have a DNS problem. >=20 >=20 > Robert Huff >=20 > _______________________________________________ > 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.=20 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, --=20 Christopher TZ: GMT + 2h --Sig_/5V+ODDXy6h7vGeQ/.V2=8dg Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iQIcBAEBAgAGBQJP6c4XAAoJEJTIKW/o3iwUgFsP+wWzDWO0Zpa1SlhGuOPGag5b LcGo8+D8mJB+CbkU7VSXm/5MREGNKCVuutrSvGt1sU24to8pfexfPM29Mb87qg+E m5JXN0nQL/Mar43UAGbtl8oVuYqoZovh0srfNMxbpBtSTm2V3CvcLZIZd6ybGTTR XThqdm+MqUujlWduPSh3gbhBgwRo/2wWacUaICBTJXKCszvYlBpCz8Lm+uH3Ytfa bavG+rtV32oi9cIC3wfNWzHzn8IBW79wkNC81Jh8F9WBuTYYITNT7uQ8nrqV007H qBHsLAOa9S7xZ6dr47WQr6Pv9ZKlJfHk2JYB588EfRZxtDUioqngBGNRfNoJRcuu I8Sss4SnBChtNWEJrFF5aCROQ5wzF75gLEhSDzvE1Ke0ovr1wEkrK4V+qBRxsb4i EXpmHGFE2ZzBngOT1rSqRA/xDthLC6lGtu8qUznBpqXedaZ7doSohqJpgg/SZPDi 5wAkTmje1E4Z3FNtS2J/zmPzPmwMIjnqrfWPsbxbtwNSdseHB36JHy1LqQkawKCw 52u9cyR71FTXg98RKxG4RpXTrWwRdFOOVQfYjLIfgjA8JqViN4rRWBCg53LIMI7v m0afLApdyFunQetzslx8H7KCt2CYzOUPfhqx7hNXJj+oSNww9Be60TUyLg0IOeqr zgsfLAikQ+6hD8e/zZOv =pMSf -----END PGP SIGNATURE----- --Sig_/5V+ODDXy6h7vGeQ/.V2=8dg--
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