Serge,
Some interesting updates.
First, with both guests running (bridged mode with br0) I ran 'brctl stp
br0 on'. Everything still worked fine.
Next I moved one of the guests from bridged mode back to virtual net (using
virbr0). I was immediately able to reproduce the connection reset problem.
brctl says:
bridge name bridge id STP enabled interfaces
br0 8000.001a64b33b10 yes eth0
vnet1
virbr0 8000.a6fdf11232ef yes vnet0
so clearly virbr0 is using stp.
Lastly, I've attached the output of 'iptables -L' during this mixed-mode
configuration. The firewall configurations are the same.
Are there any other tests you'd like me to run?
brian
** Attachment added: "iptables -L (take 2)"
https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/616064/+attachment/1521544/+files/iptables_L-2.txt
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Broken networking in kvm guests
https://bugs.launchpad.net/bugs/616064
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