Network security whole machine network card expansion solution

First of all, we need to understand what Bypass is. Let's take a simple example: Everyone knows that network security devices are generally used between two or more networks, such as between an intranet and an extranet. The application in the network security device will analyze the internal information on the network packet, and after determining that there is no threat, it will pass the packet out according to certain routing rules. However, the premise of existence is that there is no problem with the network communication equipment. When the network security device freezes, loses power, or other failures, the networks connected to this device will lose contact with each other. At that time, if we still need to require that the networks be connected, this requires Bypass to come forward.