[pptp-server] MS clients cannot connect to PoPToP through ISP

Matthias Suencksen msuencks at marcant.de
Wed Feb 14 05:41:46 CST 2001


"DaeSooChoi" <dschoi at superstar.co.kr> wrote:
> > Hi
> I have a pptp-server running that has no problems with MS windows clients over local LAN connecting, 
> but when my MS windows client attempts to connect to pptp-server through dialing-up isp. 
> 
>               MS pptp client <------------local lan---------------> Linux PoPToP server  (connection OK)
> (problem) MS pptt client <---dialing---> (through)ISP <------------internet------------> Linux PoPToP server ( connected (like below message)but disconnected immediately)
> 
> I get errors like below.
> --------------------------------
> Feb 14 11:34:10 localhost pptpd[5848]: MGR: Launching /usr/local/sbin/pptpctrl to handle client
> Feb 14 11:34:10 localhost pptpd[5848]: CTRL: pppd speed = 115200
> Feb 14 11:34:10 localhost pptpd[5848]: CTRL: pppd options file = /etc/ppp/options.pptp
> Feb 14 11:34:10 localhost pptpd[5848]: CTRL: Client 203.252.3.27 control connection started
> Feb 14 11:34:11 localhost pptpd[5848]: CTRL: Received PPTP Control Message (type: 1)
> Feb 14 11:34:11 localhost pptpd[5848]: CTRL: Made a START CTRL CONN RPLY packet
> Feb 14 11:34:11 localhost pptpd[5848]: CTRL: I wrote 156 bytes to the client.
> Feb 14 11:34:11 localhost pptpd[5848]: CTRL: Sent packet to client
> Feb 14 11:34:11 localhost pptpd[5848]: CTRL: Received PPTP Control Message (type: 7)
> Feb 14 11:34:11 localhost pptpd[5848]: CTRL: Set parameters to 0 maxbps, 16 window size
> Feb 14 11:34:11 localhost pptpd[5848]: CTRL: Made a OUT CALL RPLY packet
> Feb 14 11:34:11 localhost pptpd[5848]: CTRL: Starting call (launching pppd, opening GRE)
> Feb 14 11:34:11 localhost pptpd[5848]: CTRL: pty_fd = 5
> Feb 14 11:34:11 localhost pptpd[5848]: CTRL: tty_fd = 6
> Feb 14 11:34:11 localhost pptpd[5850]: CTRL (PPPD Launcher): Connection speed = 115200
> Feb 14 11:34:11 localhost pptpd[5848]: CTRL: I wrote 32 bytes to the client.
> Feb 14 11:34:11 localhost pptpd[5848]: CTRL: Sent packet to client

.. it would be interesting what happend in the 30 seconds between the
above line and the line below. Usually there should be some output
from pppd ( use "debug" in the pppd-options file and enable *.debug in syslog )

If pppd says "timeout sending lcp request" your ISP possibly filters GRE packets
but until now I would suspect a pppd problem.
--
Matthias

> Feb 14 11:34:41 localhost pptpd[5848]: GRE: read(fd=5,buffer=804d8a0,len=8196) from PTY failed: status = -1 error = intput/output error
> Feb 14 11:34:41 localhost pptpd[5848]: CTRL: PTY read or GRE write failed (pty,gre)=(5,6)
> Feb 14 11:34:41 localhost pptpd[5848]: CTRL: Client 203.252.3.27 control connection finished
> Feb 14 11:34:41 localhost pptpd[5848]: CTRL: Exiting now
> Feb 14 11:34:41 localhost pptpd[5835]: MGR: Reaped child 5848
> ---------------------------
> in /var/log/pptpd.log
> How can I solve "GRE: read from PTY failed ......" 
> 
>  Any help appreciated.
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> 

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