Non-NCP packet, discarding in PPP

Unanswered Question
May 20th, 2008

Hi Pros,

I m getting the below error message in a router:

*May 20 09:50:04.503: %LINK-3-UPDOWN: Interface BRI3/0:1, changed state to up

*May 20 09:50:04.503: BR3/0:1 PPP: Using dialer call direction

*May 20 09:50:04.503: BR3/0:1 PPP: Treating connection as a callout

*May 20 09:50:04.503: BR3/0:1 PPP: Phase is ESTABLISHING, Active Open

*May 20 09:50:04.503: BR3/0:1 PPP: No remote authentication for call-out

*May 20 09:50:04.503: BR3/0:1 LCP: O CONFREQ [Closed] id 255 len 10

*May 20 09:50:04.503: BR3/0:1 LCP: MagicNumber 0x37BCBB63 (0x050637BCBB63)

*May 20 09:50:04.679: Mu1 PPP: O pkt type 0x0021, datagramsize 66

*May 20 09:50:05.563: BR3/0:1 PPP: I pkt type 0xC021, datagramsize 33 link[ppp]

*May 20 09:50:05.563: BR3/0:1 LCP: I CONFREQ [REQsent] id 1 len 29

*May 20 09:50:05.563: BR3/0:1 LCP: MRU 1514 (0x010405EA)

*May 20 09:50:05.563: BR3/0:1 LCP: AuthProto PAP (0x0304C023)

*May 20 09:50:05.563: BR3/0:1 LCP: MagicNumber 0x75D7B878 (0x050675D7B878)

*May 20 09:50:05.563: BR3/0:1 LCP: PFC (0x0702)

*May 20 09:50:05.563: BR3/0:1 LCP: ACFC (0x0802)

*May 20 09:50:05.563: BR3/0:1 LCP: MRRU 1514 (0x110405EA)

*May 20 09:50:05.563: BR3/0:1 LCP: EndpointDisc 0 Null (0x130300)

*May 20 09:50:05.563: BR3/0:1 LCP: O CONFREJ [REQsent] id 1 len 8

*May 20 09:50:05.563: BR3/0:1 LCP: MRRU 1514 (0x110405EA)

*May 20 09:50:05.587: BR3/0:1 PPP: I pkt type 0xC021, datagramsize 26 link[ppp]

*May 20 09:50:05.587: BR3/0:1 LCP: I CONFREQ [REQsent] id 2 len 22

*May 20 09:50:05.587: BR3/0:1 LCP: MRU 1514 (0x010405EA)

*May 20 09:50:05.587: BR3/0:1 LCP: AuthProto PAP (0x0304C023)

*May 20 09:50:05.587: BR3/0:1 LCP: MagicNumber 0x75D7B878 (0x050675D7B878)

*May 20 09:50:05.587: BR3/0:1 LCP: PFC (0x0702)

*May 20 09:50:05.587: BR3/0:1 LCP: ACFC (0x0802)

*May 20 09:50:05.587: BR3/0:1 LCP: O CONFACK [REQsent] id 2 len 22

*May 20 09:50:05.587: BR3/0:1 LCP: MRU 1514 (0x010405EA)

*May 20 09:50:05.587: BR3/0:1 LCP: AuthProto PAP (0x0304C023)

*May 20 09:50:05.587: BR3/0:1 LCP: MagicNumber 0x75D7B878 (0x050675D7B878)

*May 20 09:50:05.587: BR3/0:1 LCP: PFC (0x0702)

*May 20 09:50:05.587: BR3/0:1 LCP: ACFC (0x0802)

*May 20 09:50:06.491: BR3/0:1 LCP: TIMEout: State ACKsent

*May 20 09:50:06.491: BR3/0:1 LCP: O CONFREQ [ACKsent] id 0 len 10

*May 20 09:50:06.491: BR3/0:1 LCP: MagicNumber 0x37BCBB63 (0x050637BCBB63)

*May 20 09:50:06.515: BR3/0:1 PPP: I pkt type 0xC021, datagramsize 14 link[ppp]

*May 20 09:50:06.515: BR3/0:1 LCP: I CONFACK [ACKsent] id 0 len 10

*May 20 09:50:06.515: BR3/0:1 LCP: MagicNumber 0x37BCBB63 (0x050637BCBB63)

*May 20 09:50:06.515: BR3/0:1 LCP: State is Open

*May 20 09:50:06.515: BR3/0:1 PPP: Phase is AUTHENTICATING, by the peer

*May 20 09:50:06.515: BR3/0:1 PAP: Using hostname from interface PAP

*May 20 09:50:06.515: BR3/0:1 PAP: Using password from interface PAP

*May 20 09:50:06.515: BR3/0:1 PAP: O AUTH-REQ id 17 len 38 from "[email protected]"

*May 20 09:50:10.503: %ISDN-6-CONNECT: Interface BRI3/0:1 is now connected to 28210160

**May 20 09:50:16.507: BR3/0:1 AUTH: Timeout 1

*May 20 09:50:16.507: BR3/0:1 PAP: Using hostname from interface PAP

*May 20 09:50:16.507: BR3/0:1 PAP: Using password from interface PAP

*May 20 09:50:16.507: BR3/0:1 PAP: O AUTH-REQ id 18 len 38 from "[email protected]"

*May 20 09:50:16.543: BR3/0:1 PPP: I pkt type 0x0A02, datagramsize 19 link[illegal]

*May 20 09:50:16.543: BR3/0:1 : Non-NCP packet, discarding

PPP connection is terminated because of the error message " Non-NCP packet discaring".

I would like to know what is the cause of this error message and any workaround to solve it.

thanks in advance

arun kumar

I have this problem too.
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Paolo Bevilacqua Wed, 05/21/2008 - 08:29

Hi, the most likely cause is that the remote system doesn't like the "auth req" sent by router twice, procced to close but some garbage is received hence the invalid packet.

Try "callin" in "ppp authentication" to not try to authenticate remote.

Hope this helps, please rate post if it does!

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