not with your current router hardware, no. there are plenty of products that will do this, though. they range from free (if you're willing to devote an old PC to the project), on upwards in price.

for home use, many will advocate a particular {linux,openbsd,etc} distribution that is geared toward routing and firewalling. i am partial to a free version of a commercial firewall, gnatbox light. it works very well, is ICSA certified, and has an upgrade path to their commercial line if/when necessary. i have it running on an old pentium pro 200, and it works like a champ.

--dan.