How The Network Camera Works

In the working mode of the security monitoring project, network camera monitoring generally runs around four modes, namely gateway mode, bridge mode, bypass mode and audit mode. The following editor will briefly introduce these four operating modes And its principle, friends who are interested can take a look.

There are several ways to operate the network camera:

1. Gateway mode: use this machine as the gateway of other computers (setting the video surveillance to be pointed to this machine by the default gateway of the computer), which can be used as single network card mode, dual network card or even multiple network card mode. The original PROXY mode is basically eliminated at present. It is no longer used, and the NAT store-and-forward method is currently commonly used.

2. Bypass mode: the use of ARP technology to establish a virtual gateway can only be suitable for small-scale network monitoring, and there can be no restricted bypass mode in the environment. The limitation of routing or firewall or the installation of ARP firewall on the supervised computer will cause the bypass to be impossible. Success, because you are bypassing while prohibiting the bypass, it is contradictory; at the same time, if multiple bypasses in the network at the same time will cause confusion and interrupt the network, but as long as the premise is the simplest deployment and the most convenient way Installation settings.

3. Observation mode: Bypass monitoring, as if there is a parallel machine listening on the side of two people's phones, so the efficiency is very low. This mode requires the use of shared HUB or switch mirroring, but if the old shared HUB is used, Affect the network export function, such as mirroring mode, on the one hand, you need to invest in two-way mirror switch equipment, on the other hand, you need a professional person to set up the mirror switch, but some switches will block the switch or reduce the network performance during the blocking process. The problem is that the function is lost.

4. Network bridge mode: dual network cards are made into a transparent bridge, and the bridge works on the second layer, so it can be simply understood as a bridge as a network cable.