Default Service Set IDentifier

You're reading Default Service Set IDentifier, posted on Friday, February 18th, 2011 at 6:55 am in Networking, on BrainBloggers at the Computers blog. More after the jump.

SSID (Service Set IDentifier) is a wireless local area network (WLAN). All the wireless devices on a WLAN need to use the same SSID so as to facilitate interaction with each other. SSID is also called: Network Name Service, Set Identifier and ESSID (Extended Service Set IDentifier).

There tends to be two techniques of setting SSID on wireless clients; the manual method and the automatic method. In the manual method the SSID is placed within the settins for the client’s network. While using the automatic method the SSID is allowed to remain automatic or blank. A public SSID that is set on the access point is often used by network administrator. This creates a chance for the transmission of data and support to all systems within range. In a bid to improve network security a number of the most recent wireless access points will turn off the automatic SSID broadcast feature. SSIDs are are case sensittive text strings. It is a sequence of letters and numbers remaining within the confines of a maximum length of 32 characters.

How a SSID WorksAn SSID identifies a 802.11(Wi-Fi) network. The SSID can be described as a secret key created by the wireless network administrator. Users must know the SSID in order to gain access with an 802.11 wireless network. The SSID however may very well be found through network scanning. The SSID is displayed automatically as part of the header for each packet forwarded over the WLAN.

Radio signals are perpetually broadcast by SSID access points. In the event that client machines are empowered, these radio signals are generally received by the systems. The connection of a client to the access point is facilitated by the automatic or manual configuration. Despite the fact that an SSID is commonly 32 items long, it is presented for the benefit of the user in human readable ASCII format. Different access points may may utilize the same SSID should they be linked to the same wireless network. Because many wireless access points allow for broadcasting of a number of SSIDs allows for the construction of Virtual Access Points. These Virtual Access Points break down a solitary physical access point into several logical access points. Each one of these created logical access points possess a particular set of security and network settings.

SSID Security Problems

The network managers often discover that a serious management challenge is presented by the fact thatthe SSID is really a secret key rather than a public key. As a result every single user of the network needs to configure the SSID into their system. Consequently the network administrator must always alter the SSID of the network in order to refuse a user admittance. This means that the SSID on every single network node must be reconfigured. Fortunately some 802.11 NICs facilitate the configuration more than one SSIDs in one task.

Standard SSID’s

Access point vendors for 802.11 often times permit the use of ‘any’ .This enables an 802.11 NIC to link with any network. Buffalo Technologies, D-Link, Cisco, Proxim, Intermec and Enterasays tend to produce wireless equipment that very often will accommodate this.The SSID is conveyed in plain text format on each occasion that the client enters the wireless network.