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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Linos <info@linos.es>
Cc: Ross J. Reedstrom <reedstrm@rice.edu>
Cc: pgsql-performance@postgresql.org
Subject: Re: TCP network cost
Date: Sun, 01 Mar 2009 13:28:24 -0500
Message-ID: <13742.1235932104@sss.pgh.pa.us> (raw)
In-Reply-To: <49AAD1CF.6000908@linos.es>
References: <1ca1c1410902171013q478f2620n13fcd68cb8b3d911@mail.gmail.com>
	<20090217070403.GB2486@cooker>
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	<3FAF940B-9B0B-4DBA-8728-6096022129DF@infogears.com>
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	<49AAC6AC.60309@linos.es>
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	<49AAD1CF.6000908@linos.es>

Linos <info@linos.es> writes:
> Tom Lane escribió:
>> That's just weird --- ssl off should be ssl off no matter which knob you
>> use to turn it off.  Are you sure it's really off in the slow connections?

> Maybe i am missing something, i use the same command to connect to it
> from localhost "psql -d database -h localhost" and in the pcap files i
> have captured the protocol it is clear (with "ssl = false" or "ssl =
> true" either), but in the debian machine with "ssl = true" in
> postgresql.conf you can see in the pcap file big time jumps between
> data packets, psql commandline enables automatically ssl if the server
> supports it?

Yeah, the default behavior is to do SSL if supported; see PGSSLMODE.
Non-TCP connections never do SSL, though.  One possibility to check
is that one of the two distros has altered the default value of
PGSSLMODE.

> but if this is the case i should see encrypted traffic in
> pcap files,

I would suppose so, so there's something that doesn't quite add up here.

			regards, tom lane



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