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SSID In WiFi

March 15th, 2007

In Wi-Fi Wireless LAN computer networking, a service set identifier (SSID) is a code attached to all packets on a wireless network to identify each packet as part of that network. The code is a case sensitive text string which consists of a maximum of 32 alphanumeric characters. All wireless devices attempting to communicate with each other must share the same SSID. Apart from identifying each packet, SSID also serves to uniquely identify a group of wireless network devices used in a given “Service Set”.

There are two major variants of the SSID.

* Ad-hoc wireless networks (IBSS) that consist of client machines without an access point use the IBSS ID (Independent Basic Service Set Identifier)
* Infrastructure networks which includes an access point (BSS or possibly an ESS) use the BSS ID or ESS ID (E for Extended) instead.

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