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Date:      Tue, 1 Dec 2009 12:16:43 -0800
From:      William Taylor <williamt@corp.sonic.net>
To:        freebsd-questions@freebsd.org
Subject:   Re: tcp delays in jails
Message-ID:  <16E3B0DF-4AD1-4CA6-BC25-124A4A82EA12@corp.sonic.net>
In-Reply-To: <hf2te0$h9b$1@ger.gmane.org>
References:  <63450BC7-7E22-4448-B030-63F34AD00749@corp.sonic.net> <hf2te0$h9b$1@ger.gmane.org>

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On Dec 1, 2009, at 3:07 AM, Ivan Voras wrote:

> William Taylor wrote:
>> I recently started having a problem with tcp connections in one of my =
jails.
>> Im running 4.9-stable
>=20
> I guess it will not do any good to tell you to upgrade to 8.0? :)
>=20
   Not at this time although I probably should eventually.  I still have =
a 3.5-STABLE box kicking around.
   I have always been a believer of if it isn't broken don't fix it.

>> both sendmail and perdition experience the same problem. I even tried =
stopping
>> everything on the box and the problem still persists.
>=20
> Just to verify - the problem is on the side of the servers (TCP =
listeners)?
>=20
   Seems to be. I could write a small tcp server and see if I can get it =
to exhibit the same behavior or not.

>> Connections to other jails on different ip's on the same box are =
fine.
>> There seems to be about a 5 second delay.
>> =46rom this snippet of a ktrace I did you can see what looks to be a =
delay of about 5 seconds  after the CALL kevent
>=20
> I'm not sure what you are tracing but this trace looks like something =
having to do with DNS.
>=20
> Does DNS resolve properly on the box? Reverse DNS also? Some servers, =
ssh and probably sendmail also, do a reverse DNS lookup on the =
connecting client.
> Just the generic ones... try seeing if DNS and reverse DNS work first.
>=20
>=20

Yes DNS is resolving properly forward and reverse. I even tried changing =
DNS servers.




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