“SSID is a case sensitive, 32 alphanumeric character unique identifier attached to the header of packets sent over a wireless local-area network (WLAN). The SSID acts as a password when a mobile device tries to connect to the basic service set (BSS) -- a component of the IEEE 802.11 WLAN architecture.”
SSID can be seen on your computer without using packet analyzer, but in case of BSSID, end user difficult to know the BSSID without packet analyzer or some other application which shows SSID together with BSSID ( for ex. wifi analyzer - android app )
[ capture from Window PC ]
[ Capture from Wifi Analyzer - Android APP ]
In case multiple AP configured to provide same BSS*, then multiple AP will transmit beacon which has same SSID. BSSID is the mac address of AP's radio interface. SSID will be advertised by AP with bssid as a the source mac address.
* BSS( basic service set ) is a set of all stations that can communicate with each other at PHY layer.
Below capture shows that BSSID can be different even Two AP advertise the same SSID named t2.
[ CASE#1 - BSSID: 20:B3:99:C1:54:28/ SSID - t2 ]
[ CASE#2 - BSSID: 00:04:96:61:AD:21/ SSID - t2 ]
on WiNG OS, SSID can be checked with the command "show wireless wlan"
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