After upgrading from 515 PIX to 515E PIX what would you recommend as the best tools available for testing the success of the installation on which the expected performance are better or a least the same as it was before the upgrade?

In a LAN environment, having two routers 2500, each of its ethernet interface conncected to a switch. If each ethernet interface is on a different subnet going to the same switch. What positive and negative accomplishments it can be achieved with thi...