[Bridge] Bridging multiple tap interfaces

Stephen Hemminger shemminger at osdl.org
Thu Jan 19 20:01:22 PST 2006


On Thu, 19 Jan 2006 21:05:01 -0500
"Elangovan, Anush" <anush at fireeye.com> wrote:

> Is it possible to bridge multiple "tap" interfaces in Linux?
> 
> When two tap interfaces are bridged together they are unable to "see"
> each other but they can bridge to external Ethernet interfaces or the
> hosts IP attached on the bridge. 
> 
> I saw some mention in the mailing list archives on bridging two user
> space processes but it didn't seem to have any conclusion. I also
> noticed some other wireless interfaces and tap interfaces are not able
> to be bridged. 
> 
> http://lists.osdl.org/pipermail/bridge/2005-December/001215.html
> 
> 
> So does the bridging code differentiate between the pseudo-devices
> before making forwarding decisions?
> 
> Thanks
> Anush

It could work now, since each tap should have it's own unique source
address. But remember anything being bridge has to "look and feel" like
a standard Ethernet for it to work.  That means broadcast and address
filtering has to work as well.



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