What is the difference between WEP ON and WEP AUTO in the weptype setting for the Linux platform of the MSD45N?

WEP ON is for legacy Wi-Fi WEP with no WPA/WPA2 authentication. WEP AUTO is configured for a profile where you want to use 802.1x authentication with WEP encryption. Rather than setting WEP with a static key, WEP AUTO allows the WEP keys to be set dynamically following a successful EAP authentication.