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Old 07-27-2004, 08:11 AM   #1
danielw
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Registered: Jul 2003
Location: Australia
Distribution: CRUX
Posts: 35

Rep: Reputation: 15
The joys of multiple PPTP connections... not.


Hello there,

I'll be honest here. I've hit rock bottom. I have googled this one for some time now, weeks it would have been. Here's a low down on the problem..

Basically I've got the following network.

Code:
LAN A
|
|
------ SME Linux 6.0 ------- ADSL Bridge -------- [Internet] -------- DSL 504 Router -------
      (F/W, Mail server,                                              (PPPOE Mode)         |
      PPTP server)                                                                         |
                                                                                           |
                                                                                    DI-804HV
                                                                    LAN B -------- VPN Router
I'm trying to get users on LAN B to connect to the VPN server located on the SME Linux server. This works all fine until one or more user on LAN B connects concurrently. That's when issues start arising. Users are all winXP machines and connect using the standard VPN connection wizard. Before the DI-804HV VPN router was installed when a second or third user tried to connect (from LAN B) he or she was refused during the authentication process. Now when the second or third user connects to the VPN, it gets past authentication, however access the VPN is not allowed, even though that person's computer is assigned another IP address by the VPN server.

What should I do in this situation?

I know PPTP doesn't like more than one connection coming from the same IP. If I could get the DI-804HV to connect to the VPN server I most certainly would. Problem being is that (too the most of my knowledge) the DI-804HV will only establish VPN links between another DI-804HV. Would setting the DSL 504 router in bridge mode and making the DI-804HV do the PPPOE fix the problem?

Here's a sample from /var/log/messages on the VPN server.
Code:
Jul 27 15:44:06 black pptpd[25914]: CTRL (PPPD Launcher): Connection speed = 460800
Jul 27 15:44:06 black pptpd[25914]: CTRL (PPPD Launcher): local address = 192.168.1.101
Jul 27 15:44:06 black pptpd[25914]: CTRL (PPPD Launcher): remote address = 192.168.1.248
Jul 27 15:44:06 black pppd[25914]: pppd 2.4.2b1 started by root, uid 0 
Jul 27 15:44:06 black pppd[25914]: Starting negotiation on /dev/pts/1  
Jul 27 15:44:06 black pptpd[25913]: CTRL: Received PPTP Control Message (type: 15)
Jul 27 15:44:06 black pptpd[25913]: CTRL: Got a SET LINK INFO packet with standard ACCMs
Jul 27 15:44:06 black pptpd[25648]: GRE: Discarding out of order packet
Jul 27 15:44:06 black pptpd[24961]: GRE: Discarding out of order packet  
Jul 27 15:44:06 black pptpd[25913]: GRE: Discarding duplicate packet
Jul 27 15:44:08 black pptpd[25648]: GRE: Discarding out of order packet
Jul 27 15:44:08 black pptpd[24961]: GRE: Discarding out of order packet
Jul 27 15:44:08 black pptpd[25913]: GRE: Discarding out of order packet
Jul 27 15:44:11 black pptpd[25648]: GRE: Discarding out of order packet
Jul 27 15:44:11 black pptpd[24961]: GRE: Discarding out of order packet
Jul 27 15:44:11 black pptpd[25913]: GRE: Discarding out of order packet
Jul 27 15:44:15 black pptpd[25648]: GRE: Discarding out of order packet
Jul 27 15:44:15 black pptpd[24961]: GRE: Discarding out of order packet
Jul 27 15:44:15 black pptpd[25913]: GRE: Discarding out of order packet
Jul 27 15:44:19 black pptpd[25648]: CTRL: Received PPTP Control Message (type: 5)
Jul 27 15:44:19 black pptpd[25648]: CTRL: Made a ECHO RPLY packet
Jul 27 15:44:19 black pptpd[25648]: CTRL: I wrote 20 bytes to the client.
Jul 27 15:44:19 black pptpd[25648]: CTRL: Sent packet to client
Jul 27 15:44:36 black pppd[25914]: LCP: timeout sending Config-Requests
Jul 27 15:44:36 black pppd[25914]: Connection terminated.
Jul 27 15:44:36 black pppd[25914]: Exit.
Jul 27 15:44:36 black pptpd[25913]: GRE: read(fd=5,buffer=804d940,len=8196) from PTY failed: status = -1 error = Input$
Jul 27 15:44:36 black pptpd[25913]: CTRL: PTY read or GRE write failed (pty,gre)=(5,6)
Jul 27 15:44:36 black pptpd[25913]: CTRL: Client xxx.xxx.72.62 control connection finished
Jul 27 15:44:36 black pptpd[25913]: CTRL: Exiting now
Jul 27 15:44:36 black pptpd[24624]: MGR: Reaped child 25913
Also all internet IP's are static.

Any and all help is appreciated.

refs:
* http://www.dlink.com/products/?pid=59 (DI-804HV)
* http://www.dlink.com.au/products/broadband/dsl504/ (DSL-504)
 
Old 07-28-2004, 06:17 AM   #2
danielw
Member
 
Registered: Jul 2003
Location: Australia
Distribution: CRUX
Posts: 35

Original Poster
Rep: Reputation: 15
I might also add that I called D-link sales support before purchasing the DI-804HV and explained my network to them. They said it would work!

Could anyone suggest if I'm doing something wrong here?


Also SME linux 6.0 by default doesn't have the 'pptp_conntrack_nat' module, would this have anything do with what I'm experiencing?
 
  


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