Date: Tue, 18 Mar 2014 08:56:09 +0000 From: Frank Leonhardt <frank2@fjl.co.uk> To: freebsd-questions@freebsd.org Subject: Re: Controlling WAN access using natd/ipfw Message-ID: <53280A29.2040902@fjl.co.uk> In-Reply-To: <5326FA3B.7080006@fjl.co.uk> References: <5326FA3B.7080006@fjl.co.uk>
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No one? I'll drive there later today and try the options safely. Regards, Frank. On 17/03/2014 13:35, Frank Leonhardt wrote: > I can see a few strategies for doing this, but as I'm about to change > a firewall remotely I'd rather have a definitive working example for > obvious reasons... :-) > > The setup is simple. natd and ipfw are currently sharing a public /29 > with a private /24. Everything on the LAN can currently do anything > likes through the gateway. > > I want to stop anything on the LAN between 192.168.1.50 and > 192.168.1.100 (for example) from getting through the gateway (they can > use the proxy). Everything else should be business as usual. > > Current ipfw script is: > > /sbin/ipfw add divert natd all from any to any via rl0 > /sbin/ipfw add pass all from any to any > > Which, as a sanity check, leads to: > > 00100 divert 8668 ip from any to any via rl0 > 00200 allow ip from any to any > 65535 deny ip from any to any > > I'm having a brain storm here. Should rule 50 be "deny ip from > 192.168.1.50-192.168.1.100 to any" > > I don't even know if it'll buy that kind of IP address list (I suspect > not). I know it does CIDR but the range doesn't suit, or a table > (which I've never used before, but if I've got the syntax I might just > as well add multiple rules as table entries in this case). And I'm > completely not sure about what natd does to all of this - never been > there before. > > So - can anyone tell me EXACTLY the line I need? It's four hours of > driving if I get it wrong... > > As a supplementary questions, presumably I can add a port number after > the source specification to block individual ports? > > Thanks, Frank. >
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