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Date:      Mon, 10 Oct 2011 14:10:53 +0700
From:      Victor Sudakov <sudakov@sibptus.tomsk.ru>
To:        FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   Re: need help with pf configuration
Message-ID:  <20111010071053.GB23778@admin.sibptus.tomsk.ru>
In-Reply-To: <4E91890D.7050105@gmx.com>
References:  <CAEZdUGikPzsN=q-m_szHJCGxGT81UGA7Lbd7remTDdiqM5p3og@mail.gmail.com> <20111008235238.GB3136@hs1.VERBENA> <CAEZdUGiV_aXM67S4Yfw-i5tPZcwCWOiKPSFCPBOLkCfWjMmjeQ@mail.gmail.com> <20111009015141.GA60380@hs1.VERBENA> <20111009051554.GA91440@admin.sibptus.tomsk.ru> <20111009083855.0e9879f6@davenulle.org> <20111009073910.GB92531@admin.sibptus.tomsk.ru> <4E91890D.7050105@gmx.com>

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Nikos Vassiliadis wrote:
> >>
> >>>I have a configuration with 2 inside interfaces, 1 outside and 1 dmz
> >>>interface. The traffic should be able to flow
> >>>
> >>>1) from inside1 to any (and back)
> >>>2) from inside2 to any (and back)
> >>>3) from dmz to outside only (and back).
> >>>
> >>>I need no details, just a general hint how to setup such security
> >>>levels, preferably independent of actual IP addressses behind the
> >>>interfaces (a :network macro is not always sufficient).
> >>
> >>You may use urpf-failed instead :network
> >>urpf-failed: Any source address that fails a unicast reverse path
> >>forwarding (URPF) check, i.e. packets coming in on an interface other
> >>than that which holds the route back to the packet's source address.
> >
> >Excuse me, I do not see how this is relevant to my question (allowing
> >traffic to be initiated from a more secure interface to a less secure
> >interface and not vice versa).
> >
> 
> What if you combine macros and lists?
> The ruleset below seems "scalable" to any number of interfaces.
> 
> inside1 = em1
> inside2 = em2
> dmz = em0
> insides = "{" $inside1:network $inside2:network "}"

The problem is, there could be several routed networks behind the
inside interfaces. Not all inside networks are directly connected, and
the :network macro works only for directly connected interfaces,
right?

-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
sip:sudakov@sibptus.tomsk.ru



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