Not sure that the firmware on the Linksys router can actually block specific ports for specific IP addresses. You may need to look at something like DD-WRT to install as your firmware on the Linksys. It provides a LOT more functionality.
http://www.dd-wrt.com/dd-wrtv2/index.php
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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