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I'm just guessing, maybe you can do more tcpdump analysis on your Controller node to see where it's blocked. I'm assuming you're using GRE:

# On Controller node
$ tcpdump -envi eth0 | grep -i gre
$ tcpdump -i eth0 -n arp or icmp

# On your integration bridge
$ tcpdump -envi br-int

# On br-tun 
$ tcpdump -envi br-tun

Also, tcpdump on physical link used by GRE tunnels (on Controller node). This might isolate the problem to the compute node or the network node.

$ tcpdump -i eth0 -n ip proto gre

If you're using GRE, ensure to have these rules on both Compute & Controller nodes:

$ iptables -I OUTPUT -p gre -j ACCEPT
$ iptables -I INPUT -p gre -j ACCEPT