Network communication from an instance to an external network fails using Flat or VLAN provider networks on HP blades with Emulex NICs

Issue

• I am using HP Blade systems for controllers and compute nodes with Emulex Network Interface. I have created vlan/flat provider networks following details in doc Is it possible to create an OpenStack instance directly connected to an external network?. But Network communication from instance to gateway in the provider network or other instances in the same network that runs on a different compute node always fails. Instances also fail to dhcp ip from neutron dhcp server. How can I resolve this?