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If ovs node running on Windows is processing NAT action on the RX side, it will reset pseudo header checksum only if the L4 checksum is same as the calculated pseudo header checksum before NAT action. Without the fix, if the L4 header checksum is filled with a pseudo header checksum (sourceip, dstip, protocol, tcppayloadlen+tcpheaderlen) OVS will still do the checksum update(replace some IP and port and recalculate the checksum). It will lead to incorrect L4 header checksum. Reported-at:https://github.com/openvswitch/ovs-issues/issues/265 Signed-off-by: Wilson Peng <pweisong@vmware.com> Signed-off-by: Alin-Gabriel Serdean <aserdean@ovn.org>