Wireless Access Network SSID learning notes

Currently, wireless access networks are developing rapidly, and SSID is an essential setting item. First, let everyone know the basic knowledge of the SSID, and then fully introduce the SSID settings in the AP. The SSID is an essential configuration item for the establishment and application of WLAN wireless LAN. But for many readers who are new to wireless access networks, the SSID is so mysterious. What exactly is the SSID? In various wireless access network applications, how should we set it?

I. What is the SSID?

The SSID is also referred to as ESSID. It is called ServiceSetIdentifier in English ", it can be understood as the "Network Name" or "Working Group name" of the Wireless Access Network ". The SSID is used to distinguish between different wireless access networks. It can contain a maximum of 32 characters. Only the same SSID can be set for wireless devices in the same LAN to enter the same network, in order to communicate with each other, we can simply think of it as the "Working Group" name for wireless networking. The SSID exists in each wireless access point. It is an essential "key" or password for the wireless client to contact the wireless access point. Using the SSID of the AP or wireless router for access control is an effective security protection mechanism for wireless center devices, it forces each client to have the same SSID value as the wireless center device.

Ii. Set SSID in AP

In APAccessPoint, Wireless Access Node, session point, or access bridge, a wireless router is actually an AP integrated with the Broadband Router function.) How can I set the SSID? By default, you do not need to set the SSID, but use the default settings used by the manufacturer at the factory. In this case, the same model of AP and wireless router have the same SSID number. If there are two AP or wireless routers of the same model in the same wireless access network area, wireless conflict may occur. By default, both the AP and the wireless router enable the "allow SSID broadcast" function. This function can broadcast the SSID numbers of the AP and the wireless router to computers in the wireless network, a computer with a wireless network card can automatically scan the SSID Number of the AP and wireless router through its default wireless signal automatic scanning settings, and can automatically add the Wireless Access Network with this ssid id.

Through the default settings of Wireless AP and wireless router, we can use the wireless function without any configuration. Of course, this setting is also safe. For a wireless access network that uses the "allow SSID broadcast" and the factory default SSID name, any computer or other smart devices with wireless network adapters, such as smart phones, that are covered by the wireless network signal, can automatically access the network through this function. If you are a malicious hacker or a fake hacker, you can easily steal valuable information. For users who require security, how should we set this? The method is simple, that is, disable the default "allow SSID broadcast" function of the device. In this way, the wireless client computer must first enter the correct "SSID" on the client computer to access the wireless access point, this ensures the security of wireless networks to a certain extent.

The default SSID name of the AP and wireless router of the same model and even the same manufacturer is the same, for example, the wireless router with the highest popularity in China, its factory default SSID is "TP-LINK", so, although the allow SSID broadcast feature is disabled, other wireless clients using the default settings for wireless routers that are also connected to the TP-LINK can still easily access your wireless network. In addition, there is another security problem, that is, if there are two or more wireless routers of the same manufacturer nearby, it is very likely that your wireless client is connected to the same SSID network with stronger neighbor signals without knowing it, which brings you security risks. Not to mention, even if you do not broadcast the SSID, some experienced wireless "network, you can also enter the "TP-LINK", "linksys", "SMC" and other common wireless router manufacturers name on their wireless clients to access your wireless access network. Therefore, when setting the AP and wireless router, You 'd better change the default SSID name from the factory to your easy-to-remember name, in this way, other users cannot simply guess the SSID number to connect to your wireless access network, reducing the chance of being hacked.