two interfaces one subnet

David Devereaux-Weber ddevereauxweber at
Mon May 11 16:22:37 CDT 2009


I work with iHDTV <>, a project that sends uncompressed high
definition television (1.5 Gbps) as UDP over two 1 Gbps interfaces.  If both
interfaces are on the same subnet, the OS sees the same router (gateway)
address on both interfaces, and the results are sub-optimal ... around 50%
packet loss.


On Mon, May 11, 2009 at 3:29 PM, Chris Meidinger <cmeidinger at>wrote:

> Hi,
> This is a pretty moronic question, but I've been searching RFC's on-and-off
> for a couple of weeks and can't find an answer. So I'm hoping someone here
> will know it offhand.
> I've been looking through RFC's trying to find a clear statement that
> having two interfaces in the same subnet does not work, but can't find it
> that statement anywhere.
> The OS in this case is Linux. I know it can be done with clever routing and
> prioritization and such, but this has to do with vanilla config, just
> setting up two interfaces in one network.
> I would be grateful for a pointer to such an RFC statement, assuming it
> exists.
> Thanks!
> Chris

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