L2TP LNS PPP auth error

Unanswered Question
Oct 1st, 2008
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Hi

I have a setup as foll

PPOE client->LAC(Radius)->LNS(Radius)

I face a strange issue only at the PPP authenticating phase.

A snapshot of the debug PPP negotiation is as foll

06:32:40: ppp67 PPP: Phase is ESTABLISHING

06:32:40: ppp67 PPP: Send Message[Dynamic Bind Response]

06:32:40: ppp67 LCP: O CONFREQ [Closed] id 1 len 39

06:32:40: ppp67 LCP: ACCM 0x000A0000 (0x0206000A0000)

06:32:40: ppp67 LCP: AuthProto PAP (0x0304C023)

06:32:40: ppp67 LCP: MagicNumber 0x1ABD01EF (0x05061ABD01EF)

06:32:40: ppp67 LCP: PFC (0x0702)

06:32:40: ppp67 LCP: ACFC (0x0802)

06:32:40: ppp67 LCP: MRRU 1524 (0x110405F4)

06:32:40: ppp67 LCP: EndpointDisc 1 R2A-7200 (0x130B015232412D37323030)

06:32:40: ppp67 LCP: I CONFREQ [REQsent] id 5 len 20

06:32:40: ppp67 LCP: ACCM 0x00000000 (0x020600000000)

06:32:40: ppp67 LCP: MagicNumber 0x6A722D66 (0x05066A722D66)

06:32:40: ppp67 LCP: PFC (0x0702)

06:32:40: ppp67 LCP: ACFC (0x0802)

06:32:40: ppp67 LCP: O CONFACK [REQsent] id 5 len 20

06:32:40: ppp67 LCP: ACCM 0x00000000 (0x020600000000)

06:32:40: ppp67 LCP: MagicNumber 0x6A722D66 (0x05066A722D66)

06:32:40: ppp67 LCP: PFC (0x0702)

06:32:40: ppp67 LCP: ACFC (0x0802)

06:32:40: ppp67 LCP: I CONFREJ [ACKsent] id 1 len 19

06:32:40: ppp67 LCP: MRRU 1524 (0x110405F4)

06:32:40: ppp67 LCP: EndpointDisc 1 R2A-7200 (0x130B015232412D37323030)

06:32:40: ppp67 LCP: O CONFREQ [ACKsent] id 2 len 24

06:32:40: ppp67 LCP: ACCM 0x000A0000 (0x0206000A0000)

06:32:40: ppp67 LCP: AuthProto PAP (0x0304C023)

06:32:40: ppp67 LCP: MagicNumber 0x1ABD01EF (0x05061ABD01EF)

06:32:40: ppp67 LCP: PFC (0x0702)

06:32:40: ppp67 LCP: ACFC (0x0802)

06:32:41: ppp67 LCP: I CONFACK [ACKsent] id 2 len 24

06:32:41: ppp67 LCP: ACCM 0x000A0000 (0x0206000A0000)

06:32:41: ppp67 LCP: AuthProto PAP (0x0304C023)

06:32:41: ppp67 LCP: MagicNumber 0x1ABD01EF (0x05061ABD01EF)

06:32:41: ppp67 LCP: PFC (0x0702)

06:32:41: ppp67 LCP: ACFC (0x0802)

06:32:41: ppp67 LCP: State is Open

06:32:41: ppp67 PPP: Phase is AUTHENTICATING, by this end

06:32:41: ppp67 LCP: I IDENTIFY [Open] id 6 len 18 magic 0x6A722D66 MSRASV5.10

06:32:41: ppp67 LCP: I IDENTIFY [Open] id 7 len 21 magic 0x6A722D66 MSRAS-0-RAMYA

06:32:41: ppp67 PAP: I AUTH-REQ id 38 len 30 from "[email protected]"

06:32:41: ppp67 PAP: Authenticating peer [email protected]

06:32:41: ppp67 PPP: Phase is FORWARDING, Attempting Forward

06:32:41: ppp67 PPP: Phase is AUTHENTICATING, Unauthenticated User

06:32:41: ppp67 PAP: O AUTH-NAK id 38 len 26 msg is "Authentication failed"

06:32:41: ppp67 PPP: Sending Acct Event[Down] id[A2]

06:32:41: ppp67 PPP: Phase is TERMINATING

06:32:41: ppp67 LCP: O TERMREQ [Open] id 3 len 4

06:32:41: ppp67 PPP: Received Disconnect from Lower Layer

06:32:41: ppp67 LCP: O TERMREQ [TERMsent] id 3 len 4

06:32:41: ppp67 PPP: Dynamic send error, close LCP

06:32:41: ppp67 LCP: State is Closed

06:32:41: ppp67 PPP: Phase is DOWN

06:32:41: ppp67 PPP: Phase is TERMINATING


The L2TP tunnel is seen to be established for a fraction of a second, but immediately disconnects due to authentication problem.

Note : There is no username or password error in this case.

Has anyone any idea on this?

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