Open Stack

Hi guys,
I installed openstack kilo last week and it worked fine for some days.
On yesterday my virtual machines stop to aquire dhcp address and if I set
address
manually they cannot ping either dhcp server or gateway.

My environment is made up of:

1 controller node
1 neutron netork node
1 kvm  computing node
2 object storage nodes
2 lvm iscsi block storage nodes

If I run "neutron agent-list" on controller node it reports the following
lines:
+--------------------------------------+--------------------+-----------------+-------+----------------+---------------------------+
| id                                   | agent_type         |
host            | alive | admin_state_up | binary                    |
+--------------------------------------+--------------------+-----------------+-------+----------------+---------------------------+
| 7e18abbf-8c6b-4463-9833-44b45dc7fec8 | Open vSwitch agent |
OpStk-NetNode   | :-)   | True           | neutron-openvswitch-agent |
| 7e67678a-5eb1-4d8b-9a44-f084187ddb03 | Open vSwitch agent |
OpStk-CompNode1 | :-)   | True           | neutron-openvswitch-agent |
| 87ebbf56-8405-4b0d-84b4-a3ad7e3c7a0c | L3 agent           |
OpStk-NetNode   | :-)   | True           | neutron-l3-agent          |
| ac6d21c3-ab38-451e-9393-9d38ea1058ec | DHCP agent         |
OpStk-NetNode   | :-)   | True           | neutron-dhcp-agent        |
| ebb2b82e-1cba-4a69-b943-bf69e7c8a478 | Metadata agent     |
OpStk-NetNode   | :-)   | True           | neutron-metadata-agent    |
+--------------------------------------+--------------------+-----------------+-------+----------------+---------------------------+

Could anyone help me ?

Many thanks and regards
Ignazio
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