For access points that comply with the IEEE 802.11n standard, the physical WLAN settings provide the option to allow or restrict data transmission according to the IEEE 802.11n standard.
Along with the selection of the individual a/b/g/n standards and a selection of mixed operating modes, the access points provide the option of using the Greenfield mode. Once activated in the physical WLAN settings for a WLAN interface, the Greenfield mode only allows WLAN clients that support the IEEE 802.11n standard to associate with the corresponding logical WLANs (SSIDs). Other WLAN clients that only work with the standards IEEE 802.11a/b/g cannot associate with these WLANs.
The IEEE 802.11n standard only allows connections that are either encrypted with WPA2/AES or unencrypted. WEP- and TKIP-based encryptions are not allowed in IEEE 802 11n. Please be aware of the following restrictions depending on the actual physical and logical WLAN settings:
- If, in the Physical settings, you activate support of a mixed-mode which includes the IEEE 802.11n standard and individual WLAN clients on a logical network only support WEP encryption, then the access point will reduce the transmission rate to the 802.11a/b/g standard, because the higher transfer rates available with IEEE 802.11n are not supported in combination with WEP.
- If, in the Encryption settings for a logical WLAN network, you enable not only AES session keys but also TKIP session keys, then the access point will use only the AES session key for this WLAN, because TKIP is not supported by IEEE 802.11n.
- If, in the Encryption settings for a logical WLAN network, you enable only TKIP session keys, then the access point will reduce the transmission rate to the 802.11a/b/g standard, because the higher transfer rates available with IEEE 802.11n are not supported in combination with TKIP.
