Rich Freeman on 27 Jan 2013 08:10:14 -0800

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Re: [PLUG] dual networking question

On Sun, Jan 27, 2013 at 10:58 AM, David Coulson <> wrote:
> because a church wants to maintain a linux firewall, right? :)
> Wait until someone moves away, or is unavailable, and you have a huge mess
> on your hands. Better to make it really simple.

I was tending to think the same thing, which is probably why somebody
suggested two internet connections (with two cheap routers).  I think
that is needlessly wasteful, but there are simpler options.

I'll assume that right now your church just has a simple wireless
router that has a LAN interface and an internet interface and the WiFi
is bridged to the LAN.  That's how every consumer router comes out of
the box.

Leave all that alone, and configure that WiFi as your protected
private WiFi.  It gets full internet access, and it is bridged on the

Get a second wireless router and plug the internet port on it into
your LAN.  Configure it to just get an IP via DHCP (which will come
from the LAN router).  Set up rules on that router to block access to
the LAN subnet with the exception of its gateway.  Open up its WiFi

The public WiFi will be double-NATed but I don't see that as a big
deal.  It won't be able to do anything but get to the Internet.  The
configuration is fairly simple and you don't touch the existing LAN
setup at all.

Your other option is to get a fancier router designed to handle these
sort of things - some of the DDWRT-out-of-the-box routers can probably
handle something like this, and probably include some kind of
terms-of-service click-through page as well.  Then you can just run
your whole network on one router.

Either way you'll want to document things, and if something breaks
they'll still need to have some kind of idea what they're doing to fix
it.  But, either solution is lighter than a linux router with three
interfaces and two wireless access points.
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