Date: Sat, 21 Jul 2012 14:58:03 +0100 From: Greg Hennessy <Greg.Hennessy@nviz.net> To: "Tonix (Antonio Nati)" <tonix@interazioni.it> Cc: "freebsd-pf@freebsd.org" <freebsd-pf@freebsd.org> Subject: RE: Question on packet filter using in and out interfaces Message-ID: <9EB23F6C23A8B6488E8BCC92A48E83264BB4D27241@PEMEXMBXVS04.jellyfishnet.co.uk.local> In-Reply-To: <500AB340.2040405@interazioni.it> References: <500826BD.3070602@interazioni.it> <9EB23F6C23A8B6488E8BCC92A48E83264BB4D26F80@PEMEXMBXVS04.jellyfishnet.co.uk.local> <500AB340.2040405@interazioni.it>
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As I recall there is a diagram out there which detail the packet flow starting with the ingress interface. It'll explain what gets evaluated where. Bear in mind the effect of the 'quick' keyword. Something I tend to always use. Regards Greg > -----Original Message----- > From: Tonix (Antonio Nati) [mailto:tonix@interazioni.it] > Sent: Saturday, 21 July 2012 11:49 PM > To: Greg Hennessy > Cc: freebsd-pf@freebsd.org > Subject: Re: Question on packet filter using in and out interfaces > > Il 20/07/2012 02:44, Greg Hennessy ha scritto: > > For PF I would tend to filter in the ingress interface, tag flows passed by > policy and put a generic pass rule on the egress interface permitting the > tagged flow. > > > > The only exception would be assignment of specific flows for shaping. > > Please see answer on other thread. If PF evaluates rules all together, > there would be no security difference on using IN or OUT rules. > > Or does PF not evaluates all rules in configuration file in same phase? > > Regards, > > Tonino > > > > > > > Greg > > > > > >> -----Original Message----- > >> From: owner-freebsd-pf@freebsd.org [mailto:owner-freebsd- > >> pf@freebsd.org] On Behalf Of Tonix (Antonio Nati) > >> Sent: Friday, 20 July 2012 1:25 AM > >> To: freebsd-pf@freebsd.org > >> Subject: Question on packet filter using in and out interfaces > >> > >> I have a basic question is on usage of 'in' or 'out' interfaces, on > >> practical usage. > >> > >> I'm having some talks in PFsense mailing list, and I'm saying there is > >> no security difference about using rulesets on output interfaces or on > >> input interfaces, as PF is evaluating all rules in the same phase. > >> > >> At the opposite, I'm told all 'in' rules are evaluated first, than there > >> is a routing phase, then the 'out' rules are finally evaluated, so it > >> is more secure to have only filters on 'in' interfaces. > >> > >> Which is the real situation? Does really Packet Filter has any security > >> advantage having only 'in' rules, or there is no difference on using out > >> interface instead of in interface? > >> > >> All start from consideration that using out interfaces would semplify a > >> lot management of complex environments, with interfaces dedicated to > >> different customers (one OUT rule on specific interface instead of > >> several IN rules on all other interfaces). > >> > >> Thanks for any clear answer you can give. > >> > >> Regards, > >> > >> Tonino > >> > >> > >> _______________________________________________ > >> freebsd-pf@freebsd.org mailing list > >> http://lists.freebsd.org/mailman/listinfo/freebsd-pf > >> To unsubscribe, send any mail to "freebsd-pf-unsubscribe@freebsd.org" > > > > > -- > ------------------------------------------------------------ > Inter@zioni Interazioni di Antonio Nati > http://www.interazioni.it tonix@interazioni.it > ------------------------------------------------------------ >
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