Instances do not get IP from DHCP and cannot ping network:dhcp IP

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Issue

Instances in network can not ping DHCP server
Instances can ping gateway and other instances
If an instance leaves a ping to the DHCP server running after 10 minutes it gets replies

Environment

Red Hat OpenStack Platform 4.0
Red Hat Enterprise Linux 6.5
Provider Networking (not VXLAN or GRE)

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