Date: Fri, 20 Jul 2012 01:44:23 +0100 From: Greg Hennessy <Greg.Hennessy@nviz.net> To: "Tonix (Antonio Nati)" <tonix@interazioni.it>, "freebsd-pf@freebsd.org" <freebsd-pf@freebsd.org> Subject: RE: Question on packet filter using in and out interfaces Message-ID: <9EB23F6C23A8B6488E8BCC92A48E83264BB4D26F80@PEMEXMBXVS04.jellyfishnet.co.uk.local> In-Reply-To: <500826BD.3070602@interazioni.it> References: <500826BD.3070602@interazioni.it>
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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.=20 The only exception would be assignment of specific flows for shaping.=20 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 >=20 > I have a basic question is on usage of 'in' or 'out' interfaces, on > practical usage. >=20 > 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. >=20 > 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. >=20 > 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? >=20 > 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). >=20 > Thanks for any clear answer you can give. >=20 > Regards, >=20 > Tonino >=20 >=20 > _______________________________________________ > 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"
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