Because the security of the network would then pivot on trusting the router
to ignore nat. Most people (or those that have something to do with linux)
these days have a bunch of 10/100 cards lying around, and they are cheap
enough.

>
> Why have two network cards in the linux box? Why not just plug
> everything into your home network switch? You can still have the linux
> box firewalling the connection without the need for extra network cards.
>

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