Abstract: A system and method to track external devices attempting to connect to a protected network using probabilistic filters. When a connection from a new external device attempts to access the protected network, the memory of a protection system, which is organized as a probabilistic filter, is searched to determine if the IP address already exists in the memory of protection system. If the search locates the IP address, the protection system terminates the connection to the external device. If the search is negative, then protection device begins the authentication process for the external device.

Abstract: A system and method are provided to receive mirrored versions of transmissions sent by a node in response to initiating transmissions received by the node over a network. At least one mirrored response transmission sent from the node in response to at least one corresponding initiating transmission is analyzed to determine whether or not the corresponding at least one initiating transmission is malicious.

Abstract: A method to mitigate attack by an upstream service provider using cloud mitigation services. An edge detection device, which located at the subscriber's network edge, is able to communicate information via status messages about attacks to an upstream service provider. The service provider is then able to mitigate attacks based on the status messages. There is a feedback loop whereby the amount of dropped traffic by the service provider is added to the network traffic to keep the mitigation request open and prevent flapping. Likewise, the detection device includes time-to-engage and time-to-disengage timers to further prevent flapping.

Abstract: A system and methods for mitigation slow HTTP, SSL/HTTPS, SMTP, and/or SIP attacks. A protection system monitors each TCP connection between a client and a server. The protection system monitors the header request time and minimum transfer rate for each client and TCP connection. If the client has not completed the data transfer in the minimum time or the data are not transferred at the minimum transfer rate, the protection system determines the connections are potentially a slow attack and resets the connections for the protected devices.

Abstract: A system and method to track external devices attempting to connect to a protected network using probabilistic filters. When a connection from a new external device attempts to access the protected network, the memory of a protection system, which is organized as a probabilistic filter, is searched to determine if the IP address already exists in the memory of protection system. If the search locates the IP address, the protection system terminates the connection to the external device. If the search is negative, then protection device begins the authentication process for the external device.