[pptp-server] GRE failures

[Jerry Kosek]

I get the same error messages trying to connect from WIN9X clients. My setup is almost identical to yours as far as all of the
configuration files are concerned. I have poptop installed on a Red Hat 6.1 server.


All,
	I set up poptop on a server, but I can't connect to it using the Linux pptp
client ( I haven't had a chance to try a WinXX client yet). There is no
firewall between machines, and no ipchains rules on the poptop server. 
TIA,
Kenny

Here is all of the info I can think of:
The Errors:
/var/log/pptp.log:
Jun  1 16:11:04 vpn pptpd[647]: MGR: Launching /usr/local/sbin/pptpctrl to
handle client
Jun  1 16:11:04 vpn pptpd[647]: CTRL: local address = 192.168.1.63
Jun  1 16:11:04 vpn pptpd[647]: CTRL: remote address = 192.168.1.2
Jun  1 16:11:04 vpn pptpd[647]: CTRL: pppd speed = 115200
Jun  1 16:11:04 vpn pptpd[647]: CTRL: Client 192.168.1.195 control connection
started
Jun  1 16:11:04 vpn pptpd[647]: CTRL: Received PPTP Control Message (type: 1)
Jun  1 16:11:04 vpn pptpd[647]: CTRL: Made a START CTRL CONN RPLY packet
Jun  1 16:11:04 vpn pptpd[647]: CTRL: I wrote 156 bytes to the client.
Jun  1 16:11:04 vpn pptpd[647]: CTRL: Sent packet to client
Jun  1 16:11:05 vpn pptpd[647]: CTRL: Received PPTP Control Message (type: 7)
Jun  1 16:11:05 vpn pptpd[647]: CTRL: Set parameters to 152 maxbps, 3 window
size
Jun  1 16:11:05 vpn pptpd[647]: CTRL: Made a OUT CALL RPLY packet
Jun  1 16:11:05 vpn pptpd[647]: CTRL: Starting call (launching pppd, opening
GRE)
Jun  1 16:11:05 vpn pptpd[647]: CTRL: pty_fd = 4
Jun  1 16:11:05 vpn pptpd[647]: CTRL: tty_fd = 5
Jun  1 16:11:05 vpn pptpd[647]: CTRL: I wrote 32 bytes to the client.
Jun  1 16:11:05 vpn pptpd[648]: CTRL (PPPD Launcher): Connection speed =
115200
Jun  1 16:11:05 vpn pptpd[647]: CTRL: Sent packet to client
Jun  1 16:11:05 vpn pptpd[648]: CTRL (PPPD Launcher): local address =
192.168.1.63
Jun  1 16:11:05 vpn pptpd[648]: CTRL (PPPD Launcher): remote address =
192.168.1.2
Jun  1 16:11:05 vpn pptpd[647]: GRE: read(fd=4,buffer=804d7c0,len=8196) from
PTY failed: status = -1 error = Input/output error
Jun  1 16:11:05 vpn pptpd[647]: CTRL: PTY read or GRE write failed
(pty,gre)=(4,5)
Jun  1 16:11:05 vpn pptpd[647]: CTRL: Client 192.168.1.195 control connection
finished
Jun  1 16:11:05 vpn pptpd[647]: CTRL: Exiting now
Jun  1 16:11:05 vpn pptpd[494]: MGR: Reaped child 647

/var/log/messages:
Jun  1 16:11:04 vpn pptpd[647]: CTRL: Client 192.168.1.195 control connection
started
Jun  1 16:11:05 vpn pptpd[647]: CTRL: Starting call (launching pppd, opening
GRE)
Jun  1 16:11:05 vpn pptpd[647]: GRE: read(fd=4,buffer=804d7c0,len=8196) from
PTY failed: status = -1 error = Input/output error
Jun  1 16:11:05 vpn pptpd[647]: CTRL: PTY read or GRE write failed
(pty,gre)=(4,5)
Jun  1 16:11:05 vpn pptpd[647]: CTRL: Client 192.168.1.195 control connection
finished
Jun  1 16:11:07 vpn kernel: ip_demasq_gre(): 192.168.1.195 -> 192.168.1.67
CID=0 no masq table, discarding 
Jun  1 16:11:32 vpn last message repeated 9 times

Configs:
Server Side:

/etc/ppp/options:
lock
debug
auth
proxyarp
+chap
+chapms
+chapms-v2
no-mppe-40
mppe-128
mppe-stateless

/etc/pptp.conf
speed 115200
debug
localip 192.168.1.63 
remote 192.168.1.66-69 
listen 192.168.1.67      

Client Side:
/etc/ppp/options:
lock
debug
noauth
+chap
+chapms
+chapms-v2
mppe-40
mppe-128
mppe-stateless

-- 
Kenny Lussier
Systems Administrator
Mission Critical Linux
******************************
If at first you don't succeed, 
destroy all evidence that you 
tried
******************************



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