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Date:      Wed, 19 Sep 2001 13:20:32 +0200
From:      "Karsten W. Rohrbach" <karsten@rohrbach.de>
To:        "Chutima S." <chutima_s@zdnetonebox.com>
Cc:        freebsd-security@FreeBSD.ORG, chutima@infoquest.co.th
Subject:   Re: How to config ipfw for ftp server
Message-ID:  <20010919132032.F52106@mail.webmonster.de>
In-Reply-To: <20010919062757.RNAO7831.mta04.onebox.com@onebox.com>; from chutima_s@zdnetonebox.com on Tue, Sep 18, 2001 at 11:27:56PM -0700
References:  <20010919062757.RNAO7831.mta04.onebox.com@onebox.com>

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Chutima S.(chutima_s@zdnetonebox.com)@2001.09.18 23:27:56 +0000:
> I try to config ipfw fot outside world can ftp to ftp server in internal
> network (real IP but behide my firewall).   I config as:
>=20
> ipfw add pass tcp from any to <ftpserver> 21 setup
>=20
> I test by ftp from Internet world.  I can login to ftpserver but can
> not open data connection for get or list files in folder.  Is it concern
> about passive mode or ftp-data port (20)?

you probably want to check out ipfilter in conjunction with ipnat which
maps ftp requests through an in-kernel stateful proxy which opens and
closes the port pair rules for established ftp sessions' data
connections via state table entries.

check out the ipfilter docs for more info.

/k

--=20
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