Same but without openvswitch.
In our case, source NAT virtual machine cannot property forward TCP traffics.
Disabling physical NIC rx-checksumming helps resolving the problem, i.e.,
ethtool -K em1 rx off
** Changed in: openvswitch (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1335292
Title:
TCP does not work properly with virtio-net and tx/rx offloading is on
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