netdev - How to hairpin two Ethernet interfaces together (L2 hub/repeater mode)?

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Message-ID: <CAKuTDr_eC4Wrv=uGthGJk3Zps=fnyAxpqqmsSDau7ZLs4PGyZw@mail.gmail.com>
Date:	Fri, 22 Feb 2013 16:10:54 -0800
From:	Petri Gynther <petri.gynther@...il.com>
To:	netdev@...r.kernel.org
Subject: How to hairpin two Ethernet interfaces together (L2 hub/repeater mode)?

Hi netdev:

I'd like to hairpin two Ethernet interfaces together (e.g. eth0 and
eth1) so that any frame received on eth0 is forwarded as-is to eth1
and vice versa.

Does Linux networking code support this? I've looked at the bridging
code, but it doesn't seem to do this (at least trivially).
Specifically, when eth0 and eth1 are added to bridge, unicast frames
destined to eth0 (or eth1) MAC address end up to the bridge interface
for local consumption, rather than being flooded to other ports on the
bridge.

Any trivial solutions to this? Can Linux bridge be configured in L2
hub/repeater mode so that it simply floods every Rx frame to all other
ports of the bridge?
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