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Date:      Mon, 15 Apr 2002 09:19:25 +0200
From:      "Idar Tollefsen" <Idar.Tollefsen@baerum.kommune.no>
To:        <freebsd-questions@freebsd.org>
Subject:   ADSL gateway - how to set up?
Message-ID:  <scba9b20.044@mail.baerum.kommune.no>

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Hello,

I have a machine running FreeBSD 4.5 STABLE. This machine has two NICs
in it, one connected to the internal LAN and one connected to a ADSL
modem (I'm using PPPoE).

I've successfully managed to set them up so that the FreeBSD machine
has access to the Internet, that works flawlessly, but I'm not able to
get this machine to act as a gateway for other computers on my network.

For the time being, internal IP addresses are used, but real once will
be put in place in the not so distant future.

I've done the following:

rc.conf:
PPP_NAT=3D"YES"
ENABLE_GATWAY=3D"YES"

ppp.conf:
nat enable yes

I then tried the following two solutions:

-Routing
I assigned an IP address to both NICs and set the default gateway
route to point to the IP address of the NIC connected to the ADSL modem,
which resulted in tun0 becoming the default route. The problem here, I
think, was that both NICs couldn't be on the same subnet. Or maybe I
shouldn't have assigned an IP address to the NIC connected to the ADSL
modem at all?

-Bridge
I didn't assign any IP address to the NIC connected to the ADSL modem
and cleared all routes. The result was that the machine itself added a
default gateway route, which still, correctly, was tun0.

Neither of these two did any good. Other computers still can't connect
trough this machine. And no, there's no firewall in place (yet).

How do I do this? I feel I'm not to far off here, just missing that last
piece of the puzzle. And what, if anything, would have to change once I
switch to "real" IP addresses?


- IT


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