I suspect that my WLAN was hacked, i.e. that someone has connected to the internet through it.
My modem is a Speedport W 502V and I would like to know if the modem keeps a log of past connections that I can search for possible intruders in the last weeks or months. Is such information kept after a reset (I had to reset the modem because I had forgotten the password and I wanted to disable the WLAN).
Or does the modem only register currently open connections?