  Ethernet is the most promising solution to reduce complexity and enhance the
bandwidth in the next generation in-car networks. Dedicated Ethernet protocols
enable the real-time aspects in such networks. One promising candidate is the
IEEE 802.1Q Time-Sensitive Networking protocol suite. Common Ethernet
technologies, however, increases the vulnerability of the car infrastructure as
they widen the attack surface for many components. In this paper proposes an
IEEE 802.1Qci based algorithm that on the one hand, protects against DoS
attacks by metering incoming Ethernet frames. On the other hand, it adapts to
the behavior of the Credit Based Shaping algorithm, which was standardized for
Audio/Video Bridging, the predecessor of Time-Sensitive Networking. A
simulation of this proposed Credit Based Metering algorithm evaluates the
concept.
