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Date:      Wed, 08 Jul 2009 19:08:59 +0100
From:      Matthew Seaman <m.seaman@infracaninophile.co.uk>
To:        Daniel Underwood <djuatdelta@gmail.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: Network traffic monitoring: BSD monitor & verifying encryption
Message-ID:  <4A54E0BB.8070405@infracaninophile.co.uk>
In-Reply-To: <b6c05a470907080736y528d4029p94a7751dadee07ec@mail.gmail.com>
References:  <b6c05a470907080615l1e674e07xfda169c75dfd9f59@mail.gmail.com>	 <4A54AA5E.80706@infracaninophile.co.uk> <b6c05a470907080736y528d4029p94a7751dadee07ec@mail.gmail.com>

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Daniel Underwood wrote:
> Thanks for the help.
>=20
> I couldn't find any flags/fields in TCP packets indicated whether
> encrypted (as in the case of SSH packets).  There isn't any, right?

Correct: there isn't anything like that in the TCP headers.  Encryption
on TCP streams is an application level thing that only affects packet
payloads.

There are transport layer encryption protocols -- eg. IPSec, OpenVPN, etc=
=2E
-- but those allow tunnelling TCP streams through them and aren't necessa=
rily
TCP themselves.

	Cheers,

	Matthew

--=20
Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
                                                  Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey     Ramsgate
                                                  Kent, CT11 9PW


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