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I need to establish SSH connection over serial between Windows and Linux machine. I used socat on Linux side to do forwarding from uart to SSH server at localhost and it works fine.

Goal: SSH client - Windows(UART) ------------ Linux (UART) - SSH server at localhost

To test the Linux side, I used Putty on Windows side to open COM port connection to SSH server on Linux, and it works.

Now the problem is, I need to use SSH client on Windows side. I tried HW VSP3 (from HW_Group) to act as TCP Server and map it to my COM port. I tested it locally by opening the COM port using Putty, and telnet to the local TCP server. I expected to see what I type on telnet terminal to appear on the Putty, and vice versa. I didn't see anything.

Probably because it's not the intended usage of HW VSP3. I also tried TCPCOM32 to no avail. I explored Putty port forwarding, I didn't see a way to forward the packet to the serial port.

My question is, what can I do on Windows side to achieve this?

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My approach would be to setup a PPP server on the Linux side on the serial port, and then configure Windows as a PPP client over the serial link.

That way you will get standard IP networking between the two machines.

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  • Thanks Tero. I will give it a shot. So, it seems that it's not feasible to run SSH over serial.
    – serenity
    Aug 29, 2021 at 1:34
  • The general idea in IP is that one implements IP on top of different layer 2 technologies like serial, ethernet, Wi-Fi etc. and then applications run on top of IP. That way applications only need to support IP.
    – Tero Kilkanen
    Aug 29, 2021 at 7:44
  • Ah, got it. Serial is the physical layer, PPP is the data link layer, and IP is the network layer. I thought I would be able to do like "socat" on Windows' side - as socat is much simpler on Linux's side. I am curious how the use of socat seems to "bypass" several OSI layers.
    – serenity
    Aug 30, 2021 at 5:16

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