In fact, whether it is Dahua, Hikvision or other well-known brands, their network settings are basically the same. The original intention of the dual network port design is nothing more than two purposes.

First: load balancing and fault tolerance. Because the large number of network hard disk video recorders or storage servers are used more and more frequently, 64-channel and 128-channel hard disk video recorders are always used, and their requirements for network transmission speed and load balance are getting higher and higher.

Second: The same video recorder realizes multi-address communication. Two different network ports can be connected to two different networks respectively, that is, set the IP of different network segments to connect to different LANs. For example, trademark netizens asked, one is connected to the special line of the Environmental Protection Agency, and the other is connected to their current IPC network switch. In fact, in the multi-address mode, some brands and models allow two network ports to set IP and gateway respectively, but DNS can only be shared. Of course, multiple different DNS can be set to meet different needs; while some brands and models only allow one network card To set the gateway, another network card can only be set to IP, and the gateway and DNS must share another network card. This requires different product types to be selected according to different manufacturers.

Next, let's talk about setting different network segments under normal circumstances to realize the setting of simultaneous access to the hard disk video recorder from the internal and external networks:

In the multi-access state, one of the two network cards should be set as the default network card. Generally, the IP of one network card and the IP of the camera are on the same network segment to meet the needs of accessing camera data, while the IP of the other network card is set It is the local area network IP of the unit or company, which is convenient for internal network management, and can also view video and recording. At the same time, it separates the camera network segment to play a certain protective role.

Or the IP of one network card and the camera IP of the same network segment are the internal network IP, and the other network card is set to the external network IP, which is used to connect to the external network and separate the internal and external networks. It is also for security purposes. At this time, connect to the network card of the external network. Set as default, which is the opposite of the previous one. The default network card is the one that needs to be connected to the external network. As for the fixed public IP direct connection or dial-up, there are other settings in the recorder, depending on the situation.

While fault tolerance and balance are equivalent to a network card, there is no separate protection.

In the multi-address setting, the client, whether it is APP, software, or WEB access, can use the IP of which network card, as long as it is in the same network segment as the network card. Of course, if there is no fixed IP on the external network, then To set up dynamic domain name resolution DDNS, different manufacturers have their own solutions, and third-party resolution can also be used, as long as the bandwidth is allowed and the traffic is sufficient.

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