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quantum single flat network, but cannot ping instances

Hello,

I setup a single flat network according to the following documentation demo:

http://docs.openstack.org/trunk/openstack-network/admin/content/app_demo_flat.html

However, instances cannot be pinged from either the compute nodes or the quantum network node (the node with the dhcp agent). Here is a paste from 'quantum net-show', 'quantum subnet-show', 'nova list', 'ip link', and 'ovs-vsctl show'.

http://paste.openstack.org/show/33935/

I created three instances, and they all seem to be assigned the right ip address, within the 1.1.1.0/24 network. The nova compute and quantum network nodes are also on the 1.1.1.0/24 network (they have ips assigned to br-eth0 after bridge setup). Can anyone provide tips as to what to check?

Thank you, Ed