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using two networks on Ubuntu 20.04

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I have around 10 computers in the same network, all with 10G network cards who have two network connectors. I would like to create a frontend network for internet and some light synchronization between the computers and one backend to transfer large files (100G each) between the computers. I'm not sure how to set up the computers for them to know that when it's internet they will use the port 1 and one it's for file transfer they will use port 2. Also, I'm looking for a way to transfer these files quickly, even with the right 10G settings (Mtu and Txqueuelen) it stills pretty slow. I heard that Netcat is way faster for example, or what about Rsync?) Any advice would be appreciated. thanks!

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I'm using Ubuntu 20.04
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