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Date:      Sun, 25 Oct 2015 11:17:09 -0400
From:      "Michael B. Eichorn" <ike@michaeleichorn.com>
To:        Ernie Luzar <luzar722@gmail.com>, freebsd-questions <freebsd-questions@freebsd.org>
Subject:   Re: promiscuous mode messages
Message-ID:  <1445786229.29271.14.camel@michaeleichorn.com>
In-Reply-To: <562CCC10.80509@gmail.com>
References:  <562CCC10.80509@gmail.com>

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On Sun, 2015-10-25 at 08:33 -0400, Ernie Luzar wrote:
> Hello list
>=20
> I was reviewing the console log [/var/og/messages] and noticed these=20
> messages.
>=20
> xlo: promiscuous mode enabled
> xlo: promiscuous mode disabled
> xlo: promiscuous mode enabled
> xlo: promiscuous mode disabled
> xlo: promiscuous mode enabled
> xlo: promiscuous mode disabled
> xlo: promiscuous mode enabled
> xlo: promiscuous mode disabled
>=20
> Now to my knowledge I did nothing to cause this.
> xl0 is the interface facing the public internet.

Are you sure? Lots of networking/monitoring tools use promiscuous mode.
In fact enabled/diabled like that is exactly what you will get if you run
tcpdump without the -p option.

> Could this have been a remote attacker?

Not really. Promiscuous mode requires root to enable/disable. An attacker
would need to be logged in and get root.

Anyway try correlating the timestamps on /var/log/messages with
/var/log/auth.log

> How to disable xl0 from being able to enter promiscuous mode?

Requires root to use already. Against a user with root resistance is
futile.
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