Log onto your router, check the manual and should should have some form of traffic logging that can be enabled. Most routers are very limited in terms of function and logging unless spending big bucks, that's why wrt is a great option but your router is supported by the looks. If its something you really need to do find a router that supports dd-wrt and flash it with the firmware, it's much less hassle then setting up and pc for home routing needs.
If you think you are being hacked or something make sure you are using wap2 and change your wifi password on a weekly basis, this will make them hack someone else s haha. It takes a long time to hack wap2 but wep can be hacked in no time.
You can setup your machine to route traffic but the down side is your machine must stay on all the time
