On 1/31/20 6:37 AM, Michael Eager wrote:
Apparently, my original post was not as clear as I thought. Password authentication on the workstation is disabled and port 22 is not forwarded by the firewall. Fail2ban would not answer the question of where the SSH access is coming from on the LAN. If something on the LAN is forwarding SSH connections, knowing that the IP is in China does not give me info about where this is happening.
Your original post was completely clear. However, something is happening on your network that you aren't aware of. The fact that you are getting connections from an external IP address means that somehow there is a path from the external internet to this computer. It's possible that another computer on your network could somehow be routing incoming packets to the computer, but the outgoing ones have to be following the default route to the default gateway. An interesting split routing. tcpdump (or wireshark) will give you the mac address and if it doesn't match your gateway, you will have to track down which computer has that mac.
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