Link Logger is the leading professional firewall logging tool for routers running DD-WRT, Tomato and similar firmware (eg Linksys WRT54G/GS/GL, WRT160N, etc). Link Logger helps you monitor your internet traffic including where, when and how your users are using the internet and what malicious traffic is attacking your network. Link Logger features 20 different reports and graphs, scan/attack alerts with information links describing the scan/attack, email alerts, custom alarms, traffic history, and much more in an easy to use Windows program to help you understand and manage your network traffic and security.
Free to try
Windows Server 2008
Router running DD-WRT, Tomato or similar firmware such as Linksys WRT54G/GS/GL, WRT160N etc. A more listing of supported hardware can be found at http://www.dd-wrt.com/dd-wrtv3/dd-wrt/hardware.html