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This sounds like a path mtu issue - the length of the IP packet is probably 1500 bytes. What are you using between the network and compute node? I see GRE adding 46 bytes and VLAN tagging adds 4 bytes. You can use something like traceroute to measure the path mtu between the nodes. Or you could try this quick test on the instance:

$ sudo ip link set mtu 1400 dev eth0