I have set up a little RPI backup 'server' (with rpi OS) on my LAN. I use it to create a backup of my main personal machine data using rsync
, and I reach it from outside my network through SSH (key-based authentification; I have disabled all the other authentification modes). My domain name provider has a DNS service that I use to assign an URL to my current IP; this IP is not fixed and I thus use ddclient
to update it when required.
However at some point the update has not been made and my dedicated script tried to SSH to an IP that was not assigned by my ISP to my network anymore (and I guess has been assigned to someone else). What kind of information has been transmitted to this 'someone else' when I tried to SSH to the wrong IP? Are there any security risks?