Date: Mon, 16 Nov 2009 21:37:11 -0800 From: Freddie Cash <fjwcash@gmail.com> To: Brian <bbayorgeon@charter.net> Cc: freebsd-ipfw@freebsd.org Subject: Re: Dansguardian, nat, & ipfw Message-ID: <b269bc570911162137v68826f21jd95d0f1414b3e1b2@mail.gmail.com> In-Reply-To: <000001ca6741$b1316520$13942f60$@net> References: <000001ca6741$b1316520$13942f60$@net>
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On Mon, Nov 16, 2009 at 8:51 PM, Brian <bbayorgeon@charter.net> wrote: > Trying to configure my gateway box running FBSD 7.2 to provide content > filtering services for some or all clients on a my network. > > The box is configured with natd and running IPFW. =C2=A0I like this combi= nation > and have been using it successfully for years. =C2=A0Not real interested = to > changing to squid or pf or whatever else may be known (or better document= ed) > to work with dansguardian. Dansguardian does not do any pages fetches on its own, it just scans pages returned by a proxy server. You cannot run Dansguardian without some kind of web proxy server. By default, the port will install Squid, but it has been shown to work with TinyProxy. > Dansguardian seems to be the preferred option for content filtering as ne= ar > as I can tell. =C2=A0There is lots of documentation out there for configu= ring > dans with squid. =C2=A0I can't find much of anything for IPFW / NAT > > So, the question is, can this be done? =C2=A0I've seen one or two suggest= ions out > there giving a brief description of how to use the fwd command to send > packets to dans but unfortunately I am not smart enough to implement that > here. You can use IPFW to fwd packet to Dansguardian quite easily: ipfw add fwd 127.0.0.1:8080 tcp from $local_subnet to any 80 in recv $local_nic ipfw add allow tcp from me to any 80 out xmit $public_nic ipfw add allow tcp from any 80 to me in recv $public_nic established The first rule redirects all HTTP traffic from the local subnet to Dansguardian. Dansguardian will then pass the packets off to a local install of Squid (uses 127.0.0.1:3128 by default). Squid will then connect out to the remote web server to grab the pages (the next two rules). You *MUST* have a web proxy server installed somewhere, that Dansguardian will forward the requests to, and receive the responses from. --=20 Freddie Cash fjwcash@gmail.com
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