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Default security group not working

Hi, I am new to the OpenStack world, and I am facing an issue about security groups, such that:

Default security group only allows communication from machines with default security group. But, I can ping and also ssh to cirros vm from my machine. With one VM, I give the related critical information below. Why default sec. group does not properly work?

ovs-vsctl show output: http://paste.openstack.org/show/75202/ iptables-save output: http://paste.openstack.org/show/75204/ brctl-show output: http://paste.openstack.org/show/75205/ ip link output: http://paste.openstack.org/show/75206/

Any idea would be appreciated.

Please help?