You're trying to shove a bunch of protocols that have nothing to do with serial consoles over a serial console. I tried to search for solutions, but all answers are about how to transfer serial over TCP, but what I want is reverse: how to transfer TCP over serial? I only want to expose a TCP port (or a UNIX socket) to users who want to connect via ssh to a VM. So if it is possible to run a bare TCP socket over serial? Or skiping IP layer created by pppd and open a TCP socket over PPP like this: +-+ Also, an IP address just for ssh is too wasted. So I tried to use pppd on serial line, and up a interface then ssh via TCP over IP over PPP.īut there are many VMs, it is hard to manage with so much interface created by ppp because of lack of automatic IP assigning. So the tunnel is connected, but it seems that it can't transfer bare TCP over serial port (maybe lack of framing and package control). Socat STDIO,raw,echo=0,escape=0x3 UNIX-CONNECT:/var/run/qemu-server/vm.serial1

Ssh_dispatch_run_fatal: Connection to UNKNOWN port 65535: message authentication code incorrect Then I tried to run ssh -vv -p 10022, but it prompts: Bad packet length 1349676916.

Socat -d -d tcp-l:10022 UNIX-CONNECT:/var/run/qemu-server/vm.serial1

#In Host: (mapped to /var/run/qemu-server/vm.serial1) Here is my try: (QEMU maps serial to a unix socket in host machine) #In Guest: (serial is /dev/ttyS1) Some of them are forbbiden to use networking, and only way to attach them is via virtual serial port.ĭue to serial console's bad features (such as working badly with tmux and vim), I want to use ssh via serial line. There are many virtual machine based on QEMU in my server.

Tcp ip over serial ppp