Just after I sent a message with request for help I
found a solution to the problem.
With help of regedit I found the checksum control
settings in registry. The NIC driver configuration UI
just does not provide means to change the settings.
After I set registry keys ChecksumTxTcp,
ChecksumRxTcp, ChecksumTxIp, ChecksumRxIp to 0 and
rebooted machine everything started to work! Before
all those keys were 1.
I'll add this information to Wiki.
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