I wrote:
> What I'm trying to do is use a combination of vtun tap tunnels and
> bridging, to make my servers feel like they're on a LAN together.

... snip ...

> Really what I want to do is forget about stp and just have each
> bridge interface send out packets over the correct tap interface based
> on what mac address is at the other end, but not bother to forward
> anything on, as it should never be necessary.

"Ross Vandegrift" <[email protected]> wrote:
> Based on your description, what you really want is broadcast GRE.
> Check out http://linux-ip.net/gl/ip-tunnels/node9.html for a basic
> description.

Unfortunately, Amazon will only route tcp/udp. Other protocols don't work, and 
as such it's not even possible to set up an ipsec-based VPN... VTun and OpenVPN 
seem to be the only solutions.

[email protected] wrote:
> Leave the master-slave server tunnel separate from the bridges?  That
> connection is different from the others anyway, and making it
> independent of the bridges will break the loop.

That doesn't work. I set up a standard ptp tunnel between the master/slave, 
leaving the bridges just for the connections to the clients. When connecting a 
bunch of clients, I still wind up with a box that routes all packets over one 
tunnel. showstp tells me that one tunnel is blocked and the other is 
forwarding. Suprising. I thought stp would find the shortest route, but this 
takes three hops as packets can go client->master->different client->slave.

> Alternatively, you could use ebtables to drop all packets in the
> FORWARD chain.

Bingo. Switching off stp on all nodes, and saying "ebtables -P FORWARD DROP" 
makes everything work exactly how I want. I hadn't found ebtables until now. :-)

Thanks for the help... :-)
Simon

-- 
Simon Detheridge - CTO, Widgit Software
26 Queen Street, Cubbington, CV32 7NA - Tel: +44 (0)1926 333680
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