VPN with GPRS connection

[clarissa1996]

Hallo.

I have configured a VPN on my Linux PC (SuSE 8.2) with "pptdp".
All works as expected and Windows clients PC can connect to my VPN.

But I have a problem with a PC connected to the Internet via a GPRS interface. The problem is not the PC but the GPRS connection.
This PC can connect to the VPN with a normal modem but not with the GPRS interface.
I have tested that the port 1723 is NOT blocked through the GPRS.

Here is the log.
Can someone help me and say me at what point the connection stops ?

Thanks for any help. Clarissa

Oct 24 16:21:04 linux pptpd[31627]: MGR: Launching /usr/sbin/pptpctrl to handle client
Oct 24 16:21:04 linux pptpd[31627]: CTRL: local address = 192.1.2.150
Oct 24 16:21:04 linux pptpd[31627]: CTRL: remote address = 192.1.2.152
Oct 24 16:21:04 linux pptpd[31627]: CTRL: pppd speed = 115200
Oct 24 16:21:04 linux pptpd[31627]: CTRL: pppd options file = /etc/ppp/options.ppp0
Oct 24 16:21:04 linux pptpd[31627]: CTRL: Client 193.247.250.1 control connection started
Oct 24 16:21:04 linux pptpd[31627]: CTRL: Received PPTP Control Message (type: 1)
Oct 24 16:21:04 linux pptpd[31627]: CTRL: Made a START CTRL CONN RPLY packet
Oct 24 16:21:04 linux pptpd[31627]: CTRL: I wrote 156 bytes to the client.
Oct 24 16:21:04 linux pptpd[31627]: CTRL: Sent packet to client
Oct 24 16:21:05 linux pptpd[31627]: CTRL: Received PPTP Control Message (type: 7)
Oct 24 16:21:05 linux pptpd[31627]: CTRL: 0 min_bps, 1525 max_bps, 32 window size
Oct 24 16:21:05 linux pptpd[31627]: CTRL: Made a OUT CALL RPLY packet
Oct 24 16:21:05 linux pptpd[31627]: CTRL: Starting call (launching pppd, opening GRE)
Oct 24 16:21:05 linux pptpd[31627]: CTRL: pty_fd = 5
Oct 24 16:21:05 linux pptpd[31627]: CTRL: tty_fd = 6
Oct 24 16:21:05 linux pptpd[31628]: CTRL (PPPD Launcher): Connection speed = 115200
Oct 24 16:21:05 linux pptpd[31628]: CTRL (PPPD Launcher): local address = 192.1.2.150
Oct 24 16:21:05 linux pptpd[31628]: CTRL (PPPD Launcher): remote address = 192.1.2.152
Oct 24 16:21:05 linux pppd[31628]: pppd 2.4.1 started by root, uid 0
Oct 24 16:21:05 linux pppd[31628]: using channel 61
Oct 24 16:21:05 linux pptpd[31627]: CTRL: I wrote 32 bytes to the client.
Oct 24 16:21:05 linux pptpd[31627]: CTRL: Sent packet to client
Oct 24 16:21:05 linux pppd[31628]: Using interface ppp0
Oct 24 16:21:05 linux pppd[31628]: Connect: ppp0 <--> /dev/pts/5
Oct 24 16:21:05 linux pppd[31628]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap 81> <magic 0x474e4f3a> <pcomp> <accomp>]
Oct 24 16:21:06 linux pptpd[31627]: CTRL: Received PPTP Control Message (type: 15)
Oct 24 16:21:06 linux pptpd[31627]: CTRL: Got a SET LINK INFO packet with standard ACCMs
Oct 24 16:21:07 linux pppd[31628]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap 81> <magic 0x474e4f3a> <pcomp> <accomp>]
Oct 24 16:21:39 linux last message repeated 16 times
Oct 24 16:21:57 linux last message repeated 9 times
Oct 24 16:21:59 linux pptpd[31627]: CTRL: Received PPTP Control Message (type: 12)
Oct 24 16:21:59 linux pptpd[31627]: CTRL: Made a CALL DISCONNECT RPLY packet
Oct 24 16:21:59 linux pptpd[31627]: CTRL: Received CALL CLR request (closing call)
Oct 24 16:21:59 linux pptpd[31627]: CTRL: I wrote 148 bytes to the client.
Oct 24 16:21:59 linux pptpd[31627]: CTRL: Sent packet to client
Oct 24 16:21:59 linux pptpd[31627]: GRE: read error: Bad file descriptor
Oct 24 16:21:59 linux pptpd[31627]: CTRL: PTY read or GRE write failed (pty,gre)=(-1,-1)
Oct 24 16:21:59 linux pptpd[31627]: CTRL: Client 193.247.250.1 control connection finished
Oct 24 16:21:59 linux pptpd[31627]: CTRL: Exiting now
Oct 24 16:21:59 linux pppd[31628]: Modem hangup
Oct 24 16:21:59 linux pppd[31628]: Connection terminated.
Oct 24 16:21:59 linux pptpd[26102]: MGR: Reaped child 31627
Oct 24 16:21:59 linux pppd[31628]: Exit.