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controller won't accept DHCP packets

Hello,

The installation was made by packstack auto install. Openstack Ocata. We got 1 controller node and 4 compute nodes including controller. The thing here, that controller don't accept DHCP packets from 3 diff computes node. Iptables blocking them. The trace was made by tcpdump. For temp check we disabled iptables at controller and it passes the DHCP leases and compute nodes set's IP's. How to fix that?

Any help would be appreciated.