Abstract: Disclosed is a distributed firewall system for a mobile network that uses hop-by-hop protocol, that includes a plurality of firewall components embedded within respective plurality of network nodes of the mobile network, and a central firewall unit communicatively coupled to each firewall component. Each firewall component is configured to compute and log checksum of each payload received by the respective node, and optionally transmit the logged checksums to the central firewall unit, and wherein the central firewall unit or each firewall component is configured to compare checksums of a payload that is received twice by respective network node, and determine whether the re-reception of the payload is a malicious response.

Abstract: A method for controlling a pump arrangement comprising a pump having a motor and a control unit. The motor, when the pump is in an active state and the motor is driven in a first direction, is associated with a load factor that corresponds to an operating condition of the pump arrangement. The pump arrangement also includes a unit configured to monitor at least one operating parameter from which the load factor of the motor can be derived.

Abstract: The invention relates to a method for controlling a pump arrangement comprising a pump (2) having a motor (7) and a control unit (6), said motor (7), when the pump (2) is in an active state and the motor (7) is driven in a first direction, being associated with a load factor that corresponds to an operating condition of the pump arrangement; the pump arrangement also comprising means for monitoring at least one operating parameter from which the load factor of the motor (7) can be derived.