Open source and free under the GNU General Public License.
Dynamically blocks flood attacks based on reputational heurisitics.
Carefully allocates network resources to legitimate users if the network is under attack.
Create exception list of users allowed to behave aggressively.
Event logs and reports show limited, dropped, and rejected events.
Untangle Forums: Attack Blocker
Untangle Wiki: Attack Blocker
Attack Blocker protects the network by:
Sanitizing all packets that Untangle receives and eliminates all packet-based attacks -- you do not need to configure any settings because this packet-cleaning is built-in functionality.
Protecting against lower-level networking attacks.
Protecting against Denial Of Service (DOS) attacks.
Protects your network from attack.
Uses technology developed in-house by Untange to profile computers interacting with your network to determine the risk of attack, and then limits, drops or rejects access from attackers.