[pptp-server] LCP unsupported protocol

Fiorenza Meini fmeini at robinson.it
Fri Nov 9 08:18:06 CST 2001


Hi there,
this is my platform where I installed PPTP:
Linux SuSE 7.2 - 2.4.4 Kernel
pppd version: 2.4.0
pptp version: 1.0.1

I have a strange behaviour: I can connect to pptp from some machines without
problem, but from other (Windows 2000 Professional, Windows NT) I can
connect, but I cannot ping my Linux box: the ip address is correctly
assigned to the calling host, and routing table seem to be ok; from Linux I
can see the connection, and from client I can see connection too, but both
machine aren't reachable each other.
I looked at my syslog file, I see:

Nov  9 12:18:25 l01 pppd[14825]: rcvd [CCP ConfAck id=0x3 <mppe 1 0 0 20>]
Nov  9 12:18:25 l01 pppd[14825]: MPPE 40 bit, stateless compression enabled
Nov  9 12:18:25 l01 pppd[14825]: Script /etc/ppp/ip-up finished (pid 14830),
status = 0x0
Nov  9 12:18:33 l01 pppd[14825]: rcvd [proto=0xd057] 19 89 42 cb fc a5 b9 52
94 6b ec 78 5b f2 dc be f6 03 a7 9e 25 bf bb 04 f4 a7 47 36 2c 15 6c 58 ...
Nov  9 12:18:33 l01 pppd[14825]: Unsupported protocol 0xd057 received
Nov  9 12:18:33 l01 pppd[14825]: sent [LCP ProtRej id=0x4 d0 57 19 89 42 cb
fc a5 b9 52 94 6b ec 78 5b f2 dc be f6 03 a7 9e 25 bf bb 04 f4 a7 47 36 2c
15 ...]
Nov  9 12:18:34 l01 pppd[14825]: rcvd [proto=0x8bd2] fe a6 f0 6e 9d 9e 58 9c
bd 28 df 3d 23 9a 33 c0 8e 3e 2d 56 91 7d 58 0e 92 5e 60 62 11 c8 30 fb ...
Nov  9 12:18:34 l01 pppd[14825]: Unsupported protocol 0x8bd2 received
Nov  9 12:18:34 l01 pppd[14825]: sent [LCP ProtRej id=0x5 8b d2 fe a6 f0 6e
9d 9e 58 9c bd 28 df 3d 23 9a 33 c0 8e 3e 2d 56 91 7d 58 0e 92 5e 60 62 11
c8 ...]
Nov  9 12:18:35 l01 pppd[14825]: rcvd [proto=0xe658] a9 fe c0 04 52 5e 1f df
19 16 f6 ac 5a d9 28 9f b2 60 94 cd 52 6f 03 45 e6 57 40 69 20 2c 07 14 ...
Nov  9 12:18:35 l01 pppd[14825]: Unsupported protocol 0xe658 received
Nov  9 12:18:35 l01 pppd[14825]: sent [LCP ProtRej id=0x6 e6 58 a9 fe c0 04
52 5e 1f df 19 16 f6 ac 5a d9 28 9f b2 60 94 cd 52 6f 03 45 e6 57 40 69 20
2c ...]
Nov  9 12:18:55 l01 pppd[14825]: sent [LCP EchoReq id=0x1 magic=0xf784a278]
Nov  9 12:18:55 l01 pppd[14825]: rcvd [LCP EchoRep id=0x1 magic=0x6d91]
Nov  9 12:19:20 l01 pptpd[14824]: CTRL: Received PPTP Control Message (type:
12)
Nov  9 12:19:20 l01 pptpd[14824]: CTRL: Made a CALL DISCONNECT RPLY packet
Nov  9 12:19:20 l01 pptpd[14824]: CTRL: Received CALL CLR request (closing
call)
Nov  9 12:19:20 l01 pptpd[14824]: CTRL: I wrote 148 bytes to the client.
Nov  9 12:19:20 l01 pptpd[14824]: CTRL: Sent packet to client

What are these unsupported protocols?
What does it means all that?

I'd like to understand where is the problem: pptp or the client machine?

Thanks

Fiorenza Meini
Robinson s.r.l.





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