Date: Mon, 29 Nov 2004 16:14:07 +0100 From: Ruben de Groot <mail25@bzerk.org> To: Jonathon McKitrick <jcm@FreeBSD-uk.eu.org> Cc: freebsd-questions@freebsd.org Subject: Re: Is this a hole in my firewall? Message-ID: <20041129151407.GA74785@ei.bzerk.org> In-Reply-To: <20041129144458.GA69798@dogma.freebsd-uk.eu.org> References: <20041127215612.GA86416@dogma.freebsd-uk.eu.org> <20041128013135.GD662@gothmog.gr> <20041128044847.GA1435@dogma.freebsd-uk.eu.org> <20041128122741.GB43088@gothmog.gr> <20041129113020.GA72673@ei.bzerk.org> <20041129132114.GA66047@dogma.freebsd-uk.eu.org> <20041129140930.GA73929@ei.bzerk.org> <20041129144458.GA69798@dogma.freebsd-uk.eu.org>
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On Mon, Nov 29, 2004 at 02:44:58PM +0000, Jonathon McKitrick typed:
> On Mon, Nov 29, 2004 at 03:09:30PM +0100, Ruben de Groot wrote:
> : On Mon, Nov 29, 2004 at 01:21:14PM +0000, Jonathon McKitrick typed:
> : > On Mon, Nov 29, 2004 at 12:30:20PM +0100, Ruben de Groot wrote:
> : > : He's using ppp-nat. So packets from his laptop will first hit rule #300 and
> : > : only after that get "nat'ed". I believe this is normal behaviour.
> : >
> : > Ah, yes. I always forget about ppp-nat.
> : >
> : > So, then, is this the best way to allow my laptop packets out? Or does it
> : > still leave the laptop exposed? I'd like to protect all the machines with
> : > one firewall, while keeping it simple, if possible.
> :
> : Your laptop won't be "exposed" by this. You could however finetune your
> : ruleset a little bit by modifying rule 300 to something like:
> :
> : allow ip from ${INTERNAL_NET} to any keep-state out xmit tun0
> :
> : where INTERNAL_NET would be e.g. 192.168.0.0/24
>
> Should I also run a firewall on the laptop then, since all traffic to the
> laptop is allowed to pass?
No. Only traffic on connections that were initiated by your laptop is
allowed to pass. That what a stateful firewall does.
Ruben
>
> jm
> --
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