Depends on the router you have. I have a Linksys, and I know there is a logging feature built-in. You can access the settings through the router's web configuration settings.
No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.