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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?

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If it was hacked then whoever did that could have deleted log files. (Assuming they are kept at all). –  Hennes Nov 25 '12 at 15:25
    
@Hennes: My point is whether the modem does have log files and where they are kept. –  Giorgio Nov 25 '12 at 15:35
    
For a modern GNU/Linux install they would be kept in /var/log. Many routers use a trimmed down version of GNU/Linux. Not all though, and I do not know what the Speedport W 502V uses. And even if it used G/L it might be turned off to save disk space, which is rather scarce in modems. -- Regardless, I meant the first comment as a "If you do have logs and you do not find anything, then that does not mean that you are safe. Merely that the modem has not been hack or that the hacker was not incompetent". –  Hennes Nov 25 '12 at 15:40
    
@Hennes: I understand. The modem only has a web-based interface and I do not have the faintest idea how to connect to it so that I can look at the log files. I am going to look if I can find some documentation. –  Giorgio Nov 25 '12 at 15:48
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