------- Comment From [email protected] 2016-09-30 02:40 EDT-------
Irrespective of default csum on/off, having csum=on breaks tcp as 
checksum_unnecessary / relevant protocol header flag not passed in higher stack 
, an so tcp eventually drop syn. Could you please check with tx=on enforced and 
see if tcp completes 3way ?.

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https://bugs.launchpad.net/bugs/1629053

Title:
  ovs bridge breaking TCP between two virtio net devices when checksum
  offload on

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