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[Darragh O'Reilly <dara2002-openstack@xxxxxxxxx>]

can you try using -e with tcpdump to see the ethernet headers - it may be arps 
from the router to ff:ff:ff:ff:ff:ff that are not getting across in that 
direction. You should continue tcpdumping on the devices along the path to the 
instance to see where the arp request (or reply) stops. You do not say which 
plugin you are using? Is it multinode? (if OVS plugin, GRE or VLANs?) Grizzly?