pptpd LCP: timeout sending Config-Requests

[Toba]

Hello the list,

I'm trying to setup a pptp server (vps) under Ubuntu 8.04.2 but I cannot.
Client is also Ubuntu.
I have error message LCP: timeout sending Config-Requests
After googling, I see that this is generally due to GRE problems.
So I did tcpdump and I see that the server send a "no-payload" packet to the 
client.

Can someone explain me what is a no-payload? 
Can someone explain me why?
Can someone had experiencing such problem and what were the solution?

Best regards,

Tôba


Below is Tcpdump on the Client And after is the Syslog on the server:

TCPDUMP:

00:49:53.847503 IP 192.168.1.2 > 96.31.X.X: GREv1, call 0, seq 1, length 40: 
LCP, Conf-Request (0x01), id 1, length 26                                                                                              
00:49:53.847522 IP 192.168.1.2 > 96.31.X.X: GREv1, call 0, seq 2, length 40: 
LCP, Conf-Request (0x01), id 1, length 26                                                                                              
00:49:53.886388 IP 192.168.1.2.49746 > 96.31.X.X.1723: . ack 189 win 108 
<nop,nop,timestamp 26392578 856145721> 
00:49:55.275638 IP 96.31.X.X > 192.168.1.2: GREv1, call 0, ack 2, no-payload, 
length 12                  
00:49:56.609742 IP 192.168.1.2 > 96.31.X.X: GREv1, call 0, seq 3, length 40: 
LCP, Conf-Request (0x01), id 1, length 26                                                                                              
00:49:58.050311 IP 96.31.X.X > 192.168.1.2: GREv1, call 0, ack 3, no-payload, 
length 12                  
00:49:59.610937 IP 192.168.1.2 > 96.31.X.X: GREv1, call 0, seq 4, length 40: 
LCP, Conf-Request (0x01), id 1, length 26                                                                                              
00:50:01.121788 IP 96.31.X.X > 192.168.1.2: GREv1, call 0, ack 4, no-payload, 
length 12                  
00:50:02.614017 IP 192.168.1.2 > 96.31.X.X: GREv1, call 0, seq 5, length 40: 
LCP, Conf-Request (0x01), id 1, length 26
00:50:04.217968 IP 96.31.X.X > 192.168.1.2: GREv1, call 0, ack 5, no-payload, 
length 12
00:50:05.615518 IP 192.168.1.2 > 96.31.X.X: GREv1, call 0, seq 6, length 40: 
LCP, Conf-Request (0x01), id 1, length 26
00:50:07.238196 IP 96.31.X.X > 192.168.1.2: GREv1, call 0, ack 6, no-payload, 
length 12
00:50:08.619164 IP 192.168.1.2 > 96.31.X.X: GREv1, call 0, seq 7, length 40: 
LCP, Conf-Request (0x01), id 1, length 26
00:50:10.131416 IP 96.31.X.X > 192.168.1.2: GREv1, call 0, ack 7, no-payload, 
length 12
00:50:11.619409 IP 192.168.1.2 > 96.31.X.X: GREv1, call 0, seq 8, length 40: 
LCP, Conf-Request (0x01), id 1, length 26
00:50:13.221104 IP 96.31.X.X > 192.168.1.2: GREv1, call 0, ack 8, no-payload, 
length 12
00:50:14.622052 IP 192.168.1.2 > 96.31.X.X: GREv1, call 0, seq 9, length 40: 
LCP, Conf-Request (0x01), id 1, length 26
00:50:16.107834 IP 96.31.X.X > 192.168.1.2: GREv1, call 0, ack 9, no-payload, 
length 12
00:50:17.625290 IP 192.168.1.2 > 96.31.X.X: GREv1, call 0, seq 10, length 40: 
LCP, Conf-Request (0x01), id 1, length 26
00:50:19.205863 IP 96.31.X.X > 192.168.1.2: GREv1, call 0, ack 10, no-payload, 
length 12


SYSLOG:
Jun 13 01:49:57 vps2 pptpd[12166]: MGR: Launching /usr/sbin/pptpctrl to handle 
client
Jun 13 01:49:57 vps2 pptpd[12166]: CTRL: local address = 192.168.0.1                 
Jun 13 01:49:57 vps2 pptpd[12166]: CTRL: remote address = 192.168.0.234              
Jun 13 01:49:57 vps2 pptpd[12166]: CTRL: pppd options file = /etc/ppp/pptpd-
options  
Jun 13 01:49:57 vps2 pptpd[12166]: CTRL: Client 41.188.X.X control connection 
started
Jun 13 01:49:57 vps2 pptpd[12166]: CTRL: Received PPTP Control Message (type: 
1)        
Jun 13 01:49:57 vps2 pptpd[12166]: CTRL: Made a START CTRL CONN RPLY packet             
Jun 13 01:49:57 vps2 pptpd[12166]: CTRL: I wrote 156 bytes to the client.               
Jun 13 01:49:57 vps2 pptpd[12166]: CTRL: Sent packet to client
Jun 13 01:49:58 vps2 pptpd[12166]: CTRL: Received PPTP Control Message (type: 
7)
Jun 13 01:49:58 vps2 pptpd[12166]: CTRL: Set parameters to 10000000 maxbps, 3 
window size
Jun 13 01:49:58 vps2 pptpd[12166]: CTRL: Made a OUT CALL RPLY packet
Jun 13 01:49:58 vps2 pptpd[12166]: CTRL: Starting call (launching pppd, 
opening GRE)
Jun 13 01:49:58 vps2 pptpd[12166]: CTRL: pty_fd = 6
Jun 13 01:49:58 vps2 pptpd[12166]: CTRL: tty_fd = 7
Jun 13 01:49:58 vps2 pptpd[12179]: CTRL (PPPD Launcher): program binary = 
/usr/sbin/pppd
Jun 13 01:49:58 vps2 pptpd[12179]: CTRL (PPPD Launcher): local address = 
192.168.0.1
Jun 13 01:49:58 vps2 pptpd[12179]: CTRL (PPPD Launcher): remote address = 
192.168.0.234
Jun 13 01:49:58 vps2 pptpd[12166]: CTRL: I wrote 32 bytes to the client.
Jun 13 01:49:58 vps2 pptpd[12166]: CTRL: Sent packet to client
Jun 13 01:49:58 vps2 pppd[12179]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so 
loaded.
Jun 13 01:50:00 vps2 pptpd[12166]: GRE: accepting packet #1
Jun 13 01:50:00 vps2 pptpd[12166]: GRE: accepting packet #2
Jun 13 01:50:03 vps2 pptpd[12166]: GRE: accepting packet #3
Jun 13 01:50:06 vps2 pptpd[12166]: GRE: accepting packet #4
Jun 13 01:50:09 vps2 pptpd[12166]: GRE: accepting packet #5
Jun 13 01:50:12 vps2 pptpd[12166]: GRE: accepting packet #6
Jun 13 01:50:15 vps2 pptpd[12166]: GRE: accepting packet #7
Jun 13 01:50:18 vps2 pptpd[12166]: GRE: accepting packet #8
Jun 13 01:50:21 vps2 pptpd[12166]: GRE: accepting packet #9
Jun 13 01:50:24 vps2 pptpd[12166]: GRE: accepting packet #10
Jun 13 01:50:27 vps2 pptpd[12166]: CTRL: Received PPTP Control Message (type: 
12)
Jun 13 01:50:27 vps2 pptpd[12166]: CTRL: Made a CALL DISCONNECT RPLY packet
Jun 13 01:50:27 vps2 pptpd[12166]: CTRL: Received CALL CLR request (closing 
call)
Jun 13 01:50:27 vps2 pptpd[12166]: CTRL: Reaping child PPP[12179]