Could you perhaps tell us what kind of firewall (and version) you are running and just what the firewall is loggin? Is it an attemp at port 135 for example?

Did you install any new software (especially network based) on your computer? Perhaps it could be a program tyring to contact remote servers to funtion. Kazaa will often cause some interesting results on some firewalls.

The more information we have, the better we can help you. If you still believe that these are attack attempts, use http://www.samspade.org and run the IP through there, then contact the abuse desk of whatever network comes up. Just be quick, to the point, and include firewall type/version, and the necessary parts of the logs. (They don't have time to see what you did on your computer for the past 90 days... )

Dave