Introduction and configuration method of wireless SSID identification

Source: Internet
Author: User
Tags connect requires

In wireless Security configuration and network encryption, you must have heard the name SSID, then you know what it is specifically used for? The following article will give you a detailed description of the wireless SSID identification. Hope that through this article, we can give you a comprehensive understanding of the wireless SSID logo.

First, what is the wireless SSID identification, how to configure

SSID/ESSID (Service Set Identifier) is called "Service Area identifier matching", "business group identifier" abbreviation, can have up to 32 characters, in layman's parlance, it is like "Workgroup" in Wired LAN The identity is the same as the wireless client and wireless router, the same password, only in the same premise to allow wireless network card access to the wireless router, which is also a key to ensure the security of wireless networks one of the important measures.

Wireless workstations equipped with wireless adapters must fill in the correct wireless SSID identity and be the same as the SSID of the wireless access point (AP or wireless router) to access the AP, and if the SSID presented is different from the SSID of the AP or wireless router, the AP will deny him access through the service Area/workgroup. Therefore, the SSID can be considered as a simple password, thus providing a password authentication mechanism to achieve a certain security. To change the SSID of a wireless network card, in addition to changing it in the wireless adapter configuration program, it can be changed directly in the operating system.

Take Windows98 as an example, enter the Windows system, right-click "My Network Neighborhood" and click "Properties". In Network configuration, select the network adapter you want to modify, and in network, check the name of the wireless card adapter that you are using, click Properties, and then select the Advanced column. Fill in the SSID/ESSID option in the advanced option with the SSID name of the wireless AP or route, and then fill in the SSID/ESSID option with a key value that is the SSID name.

However, the wireless access point AP broadcasts its SSID outward, which decreases the security level. In addition, in general, users configure their own client systems, so many people know that the SSID is easy to share with illegal users. The standard working Group also said that some manufacturers support the "any" SSID, as long as the wireless client in the AP range, it will automatically connect to the AP, which will bypass the security features of the SSID. So support for this technology in wireless LAN access point AP or wireless routing is to keep the AP or wireless router from broadcasting its SSID number so that the wireless workstation must provide the correct SSID to connect to the AP or wireless router.

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Second, the wireless SSID logo can ensure the safety of wireless use

The security problem with SSID comes primarily from two groups of users: One is the first contact with the wireless network of individual users, Office users, as well as the security is not very concerned about such users, they generally adopt the wireless AP or route by default to use the SSID of the allowed broadcast mode; a wireless hotspot for public wireless networks (that is, wireless access points, It is also made up of wireless APs or wireless routes, such as hotels, libraries, bars, school campuses and so on, to enable all the public or users in the service area to use wireless access, which also uses the open SSID Broadcast mode.

WLAN wireless LANs are generally popular with mainstream users in the last two years, ranging from homes and campuses to coffee shops, where various wireless access points may exist. Wireless local network equipment itself has the characteristics of cost-effective, but also allows anyone to establish a wireless access point. For a wireless access point that requires any broadcast of its SSID, malicious or hacker can use the same SSID to enter any 802.11 access point and easily steal valuable information from the user.

In addition, another problem is that if a public wireless access broadcasts its wireless SSID identity, As long as anyone who knows a bit of technology knows that using the same SSID can set another 802.11 access point, if this signal is stronger than the hot signal or not worse than the time, the general user will be easy to choose the strong and according to the familiar SSID to enter, you in the "free" to enjoy its services at the same time, You are all more in the "Evil Twin true Monkey King" the same as the false Goku wireless access point of control. For convenience, in the Windows operating system, DHCP does not really care about which hotspot you are connecting, because the user generally sets the wireless network to automatically connect to the same wireless network while setting up the wireless network, which allows the user to unknowingly enter the SSID wireless access point similar to the public wireless access point.

So, for the average user, in the free "service" of the public through the wireless access point, if you have more important information that requires security (such as a variety of user names and passwords, and so on), or in the actual settings, most wireless APs or wireless routers at the factory default "Allow broadcast SSID" set to " Do not broadcast SSID ". So that other users want to automatically access your wireless access point, it is necessary to manually enter the correct "SSID" to enter the network, this first to a certain extent, to ensure the use of WLAN security, to prevent malicious users in the not too safe or not very safe personal WLAN in random wandering.

In addition, except for operating systems such as Windows XP (the 802.11i standard extends the definition of SSID broadcasts, you can put information that extends the wireless SSID identity inside the original broadcast package; wpa2/802.11i related patches for Windows XP SP2. Can be viewed in the extended SSID to automatically scan the wireless access point, you will find in the mainstream wireless network card driver/configuration program in the "SSID" option will also have an "any (the" "" any (available access points), what is this? In fact, it is the automatic detection of the most powerful wireless network SSID meaning, when you have more than one wireless network or wireless network in the area of unknown use of wireless card, you can select this, it will automatically detect the wireless SSID identity and connect to the wireless network. This is why the broadcast SSID can be easily entered by almost any mobile device with a wireless card.

So for users who need security, MAC address access control, WEP, 802.11x, WPA and other security standards can be used to achieve the security of wireless access points. But the best/worst of things is more or more complementary, the first is that WEP itself is easy to crack, and not all wireless cards support 128-bit or above encryption method WEP key or even 802.11x, WPA, and some old wireless network card may only support 40-bit mode of encryption or 64-bit mode of encryption, There is no support at all. Also not all network cards can support the 802.11x and WPA standards, some of the network card through the upgrade driver can support, and most of the early network card is not supported at all.

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