this section describes the firewall features provided by pix firewall. these firewall features control network activity associated with specific kinds of attacks. this section includes the following topics:

    · unicast reverse path forwarding

    · flood guard

    · fragguard and virtual re-assembly

    · dns control

    · activex blocking

    · java filtering

    · url filtering

    for information about features that allow using specific protocols and applications across the firewall,refer to "enabling specific protocols and applications."