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Date:      Fri, 6 Jun 1997 11:50:14 -0600 (MDT)
From:      Wes Peters - Softweyr LLC <softweyr@xmission.com>
To:        grog@FreeBSD.ORG
Cc:        questions@FreeBSD.ORG
Subject:   Re: Has anybody seen this PPP "protocol"?
Message-ID:  <199706061750.LAA09884@xmission.xmission.com>
In-Reply-To: <199706061046.UAA24640@freebie.lemis.com> from "grog@FreeBSD.ORG" at Jun 6, 97 08:16:36 pm

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> 
> I'm currently trying to dial into a system in China using ppp, and
> it's not succeeding.  The login succeeds, but then each end rejects
> the packets from the other end with the message "invalid protocol".
> Here's an excerpt from the debug log:
> 
> 06-06 18:55:36 [24506]  myaddr = 130.252.88.220  hisaddr = 130.252.88.217
> 06-06 18:55:36 [24506] OsLinkup: 130.252.88.217
> 
> *** At this point, I presume the connection to have been made.  What
> *** comes below should be traffic.  As you can see, it doesn't work.
> 
> 06-06 18:55:40 [24506] Unknown protocol 0x00cf
> 06-06 18:55:40 [24506] LCP: SendProtoRej
> 06-06 18:55:40 [24506] CCP: Received Configure Request (2) state = Closed (2)
> 06-06 18:55:40 [24506]   CCP: SendTerminateAck
> 06-06 18:55:45 [24506] CCP: Received Configure Request (3) state = Closed (2)
> 06-06 18:55:45 [24506]   CCP: SendTerminateAck
> 06-06 18:55:45 [24506] Unknown protocol 0x00cf
> 06-06 18:55:45 [24506] LCP: SendProtoRej
> 06-06 18:55:50 [24506] Unknown protocol 0x00cf
> 06-06 18:55:50 [24506] LCP: SendProtoRej
> 06-06 18:55:50 [24506] CCP: Received Configure Request (4) state = Closed (2)
> 06-06 18:55:50 [24506]   CCP: SendTerminateAck
> 06-06 18:55:54 [24506] LCP: LayerDown
> 06-06 18:55:54 [24506] OsLinkdown: 130.252.88.217
> 06-06 18:55:54 [24506] Already set route addr dst=fc82, gateway=d958fc82
> 06-06 18:55:54 [24506] Phase: Terminate
> 06-06 18:55:54 [24506] LCP: SendTerminateReq.
> 06-06 18:55:54 [24506] LCP: state change Opend --> Closing
> 06-06 18:55:55 [24506] LCP: Received Terminate Ack (2) state = Closing (4)
> 06-06 18:55:55 [24506] LCP: state change Closing --> Closed
> 06-06 18:55:55 [24506] LCP: LayerFinish
> 06-06 18:55:55 [24506] Phase: Dead
> 06-06 18:56:36 [24506] PPP Terminated.
> 
> As far as I can tell from this log, it looks as if the other end is
> sending a packet of type '0xcf', which may be related to
> configuration.  Unfortunately, user mode ppp (and, from what I've seen
> of the code, kernel ppp) doesn't mention this stuff at all.  Does
> anybody recognize what the other end's trying to do?  FWIW, I suspect
> it's a Microsoft box.

RFC 1661 identifies this as (PPP NLPID) on page 5, but says absolutely
*nothing* about what PPP NLPID might be.  A grep of all of the RFCs
reveals that this is a Network Layer Protocol ID, which is used when
PPP is being transported by a link-oriented network protocol.
Specifically, it is mentioned in the RFCs for PPP on X.25 and PPP on
Frame Relay.  It seems that your ISP has confused your dial-up line for
a synchronous link of some sort.  ???

-- 
          "Where am I, and what am I doing in this handbasket?"

Wes Peters                                                       Softweyr LLC
http://www.xmission.com/~softweyr                       softweyr@xmission.com



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