FortiGate PPOE password recovery

# diagnose debug enable
# diagnose debug application ppp 3

PPP send: LCP Configure_Request id(1) len(14) [Maximum_Received_Unit 1492] [Magic_Number 2D7552F8] 
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PPP send: LCP Echo_Request id(0) len(8) [Magic_Number 2d76a8f7]
PPP send: PAP 66 66 74 75 6f 75 75 6f 75 66 66 74 75 74 2e 6e 65 74 08 78 64 66 66 75 --> Authentication_Request id(1) peerid(len=18, 1234567@1234567890) passwd(len=8, 12345678)
PPP recv: LCP Echo_Reply id(0) len(8) [Magic_Number 6a6532d93]
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