In order to use fast roaming with IAPP, you need to assign an individual IAPP passphrase in the WLAN encryption settings for each interface. This is used to encrypt the pairwise master keys (PMKs). APs that share a matching IAPP passphrase (PMK-IAPP secret) are able to exchange PMKs between themselves and ensure uninterrupted connections.
In LANconfig, the IAPP passphrase is entered by navigating to and then clicking on WLAN encryption settings. Open the configuration dialog box for the appropriate interface and switch to the Advanced tab.
Note: Please note the use of IEEE 802.11r requires WPA2 key management in the encryption settings to be set to "Fast roaming".