Date: Tue, 12 Jul 2011 18:05:26 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Michael Sierchio <kudzu@tenebras.com> Cc: Bill Tillman <btillman99@yahoo.com>, freebsd-questions@freebsd.org Subject: Re: IPFW Firewall NAT inbound port-redirect Message-ID: <20110712230525.GJ6611@dan.emsphone.com> In-Reply-To: <CAHu1Y73-M7Ds=zNUDDJboh7_eEPT-uiL6qULBghFJK__NiFKzQ@mail.gmail.com> References: <CAHu1Y70Uq1AkMF--rB8sAw2M1NW8a0x1H9voTPsy3cm5vQ6O2Q@mail.gmail.com> <20110711170729.GG6611@dan.emsphone.com> <1310473165.58370.YahooMailRC@web36501.mail.mud.yahoo.com> <CAHu1Y725TGa8D=TQCKa7VQYDVAFLoABdFOZ%2BJwnMOBck0gWzyA@mail.gmail.com> <20110712160304.GI6611@dan.emsphone.com> <CAHu1Y73-M7Ds=zNUDDJboh7_eEPT-uiL6qULBghFJK__NiFKzQ@mail.gmail.com>
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In the last episode (Jul 12), Michael Sierchio said:
> On Tue, Jul 12, 2011 at 9:03 AM, Dan Nelson <dnelson@allantgroup.com> wrote:
> > In the last episode (Jul 12), Michael Sierchio said:
> >> Is there a way of specifying a particular public address if there is
> >> more than one bound to the external interface? A la
> >>
> >> nat 123 config if re0.2 log same_ports redirect_port tcp 10.0.0.3:22 102.10.22.1:2222
> >
> > Yes; the redirect_port syntax is described in the natd manpage:
> >
> > redirect_port proto targetIP:targetPORT[-targetPORT]
> > [aliasIP:]aliasPORT[-aliasPORT]
> > [remoteIP[:remotePORT[-remotePORT]]]
> >
>
> We're not talking about natd. The question was about the use of
> ipfirewall nat.
Right, but ipfw nat is basically the userland libalias library loaded as a
kernel module, so the config parameters are the same.
$ grep MODULE_DEPEND /sys/netinet/ipfw/ip_fw_nat.c
MODULE_DEPEND(ipfw_nat, libalias, 1, 1, 1);
MODULE_DEPEND(ipfw_nat, ipfw, 2, 2, 2);
also, man ipfw:
NETWORK ADDRESS TRANSLATION (NAT)
ipfw support in-kernel NAT using the kernel version of libalias(3).
[..]
REDIRECT AND LSNAT SUPPORT IN IPFW
Redirect and LSNAT support follow closely the syntax used in natd(8).
See Section EXAMPLES for some examples on how to do redirect and lsnat.
--
Dan Nelson
dnelson@allantgroup.com
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