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's Attack Blocker helps administrators prevent Denial-of-Service attacks and keep the network focused on legitimate uses. "Unfriendly" machines earn bad reputations and are limited, dropped and rejected. Attack Blocker can also quickly identify unauthorized use of network resources and stop those resources from being allocated to unauthorized users.

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