We are using Peplink 380 and encountered the following issue with the connection.
It has 3 WAN ADSL links and the profiles are configured like this:
WAN 1 - ADSL PPPoE connected
WAN 2 - ADSL PPPoE connected
WAN 3 - Peplink performs the PPPoE connection
(Dashboard shows “ No PPPoE service detected ” - as it can be seen in the attached snip)