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To your first question:

  1. Check your nova.conf file on Compute node, and what is the value you set to below parameters: flat_interface = eth1 public_interface = eth1 These should be other then eth0.

  2. If everything is fine, then down the br100 bridge and check the network connectivity.

Second question first, 1. Try to ping br100 which is "". 2. If that succeeded then add security group rules to VMs (default security group is "default") using below commands: nova secgroup-add-rule default icmp -1 -1 nova secgroup-add-rule default tcp 22 22 3. It still you are not able to ping and ssh to the instances then check the console log of that instance (/var/lib/nova/instances/<instance_id>/console.log). In that you find "Sending discover" to the IP check it once.

Now your first question: