Try to enable "service nagle" on this router.

Can you provide us the routing table?I think you cannot do this at the same time:redistribute connected metric 2000 metric-type 1 subnetsnetwork 52.72.31.1 0.0.0.0 area 0.0.0.84Since the 52.72.31.1 is the addr of eth and you put this net on the area ...