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Providing network security is one of the most important tasks in today's Internet. Unfortunately, many users are not able to protect themselves and their networks. Therefore, a novel security concept is presented to protect users by providing security measures at the Internet Service Provider level. Already now, Internet Service Providers are using different security measures, e.g., Virtual Local Area Network tags, MAC limitation, or MAC address translation. The presented approach extends these security measures by three hardware-based security subsystems. A firewall engine controls the header of Ethernet frames, Internet packets, and the next following protocols.
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