Parasitic traffic within the local network TCP ACK, how to remove?

Question

Computer networks

Local network for 5 machines. 3 computers on Win 7, two on Win 10. On one of the machines on Win 10, when working with shared folders on the network or with the 1c database in the shared folder, incomprehensible parasitic traffic is generated from ACK requests, which slows down work on this machine as when transferring files , as well as in 1s. During the day, the machine, when working in 1s over the network, receives 15GB of internal traffic, while others working remotely from 1s of the machine receive a maximum of 2-4GB.

With the help of winshark it was possible to find out the following picture:


The problem is only in one machine. The rest work fine with each other.

Tried to disable various services, processes, change the network card. All the same. Maybe the problem is in setting up a network connection on this machine? Please help determine the direction for digging.

Answer 1

Is she Master Browser by any chance?
Show the output
of nbtstat -a computer name

Answer 2

In principle, ACK is a normal network packet, used all the time in the network protocol.
What will show if you poke into the package and select follow tcp stream ?
What do you have on ports 445 and 50191 on the machine?
The reassembled pdu confuses me a little, do you have the same mtu and mss on the machines?