loopback network device

[Bruno Wolff III]

On Fri, Feb 01, 2008 at 11:24:08 +0100,
  Jordi Prats <jprats at cesca.es> wrote:
> Hi all,
> It's possible to create an alias of a device? Something like a device 
> loN that all it's traffic is send to ethN, so ethN and loN are equivalent.
> 
> It's for a bridged setup, i'm not trying to setup another IP on a device.

You don't set up loopback devices to do this.
brctl is used to describe bridged interfaces. If you want this to be set up
on boot you can put the commands in /etc/rc.d/rc.local (though its late in
the boot process if that matters for you).