"Loopback" route through two cards?

[Rusty Russell <rusty@xxxxxxxxxxxxxxx>]

Hi all,

        I know this is an FAQ, but I never saw an answer I liked.  We
want to stress-test a couple of gigabit NICs by connecting them to
each other and routing packets out one and into the other.  Is this
still impossible without nat?

Rusty.
--
  Anyone who quotes me in their sig is an idiot. -- Rusty Russell.