Date: Mon, 2 Jun 2003 10:43:07 -0400 (EDT) From: Matthew George <mdg@secureworks.net> To: Vandyuk Eugene <duke@irpen.kiev.ua> Cc: freebsd-security@freebsd.org Subject: Re: Packet flow through IPFW+IPF+IPNAT ? Message-ID: <20030602104108.Q40213@localhost> In-Reply-To: <20030531122028.A16361@irpen.kiev.ua> References: <20030531122028.A16361@irpen.kiev.ua>
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On Sat, 31 May 2003, Vandyuk Eugene wrote: > Hi. > > On my FreeBSD 4.8 configured IPFW2+IPF+IPNAT and I use them all: > - IPFW - traffic accounting, shaping, balancing and filtering; > - IPFilter - policy routing; > - IPNAT - masquerading. > I want to know, how IP-packets flow through all of this components? > What's the path? > incoming: IPFW Layer2 -> IPFW&Dummynet -> IPNAT -> IPFilter ? > outgoing: IPFW Layer2 -> IPFW&Dummynet -> IPFilter -> IPNAT ? > Is this correct? Or IPNAT on the incoming packets run before IPFW L3: > incoming: IPFW Layer2 -> IPNAT -> IPFW&Dummynet -> IPFilter ? > I think this path is more preferable, because IPFW always use not > masqueraded IP-headers. > > Any help appreciated. > _______________________________________________ > freebsd-security@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-security > To unsubscribe, send any mail to > "freebsd-security-unsubscribe@freebsd.org" > I have ipfw compiled in and run ipfilter as a kld the way it works is ipfw -> ipnat -> ipfilter ipnat and all state matching for ipfilter is performed prior to ruleset processing -- Matthew George SecureWorks Technical Operations
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