[pptp-server] VPN with PPTP on ADSL : impossible to make it work!!! Please Help

[Ivan Maillard]

In fact, the client was behind a masquerading server (not patched). That's
now solved.

Thanks anyway for your kindness !

Ivan.



-----Message d'origine-----
De : pptp-server-admin at lists.schulte.org
[mailto:pptp-server-admin at lists.schulte.org]De la part de Dani Arbel
Envoyé : vendredi 30 novembre 2001 13:43
À : Ivan Maillard
Cc : pptp-server at lists.schulte.org
Objet : Re: [pptp-server] VPN with PPTP on ADSL : impossible to make it
work!!! Please Help


could it be that your connection does not pass the gre protocol? it is ip
protocol 47 .. I had this problem with iptables. had to specificaly allow
this protocol (default or any wouldn't do).
Dani

On Wed, 28 Nov 2001, Ivan Maillard wrote:

> Hi,
>
> I do not succeed to make a VPN working with :
>
> * a RH 7.2 linux server supporting an ADSL connection to the Internet
> (Nettissimo from France Telecom), using rp-pppoe-3.2-3 package (ppp0
> interface)
> * PPTP 1.0.1 on that linux server
> * Win98 clients
>
> My /etc/pptpd.conf
>
> speed 115200
> pidfile /var/run/pptpd.pid
> options /etc/ppp/options.vpn
> debug
> listen 193.251.45.35
> localip 10.1.1.201-220
> remoteip 10.1.1.221-240
>
> My /etc/ppp/options.vpn
>
> lock
> debug
> auth
> +chap
> proxyarp
>
> My /etc/ppp/chap-secrets
>
> #username	servername	secret		ipaddress
> login_fai	*		passwd_fai	*
> validname	*		validpass	*
>
>
> When VPN logon trying (ipchains being deactivated) :
>
> Nov 28 17:07:48 JIGAGate pptpd[24353]: MGR: Launching
> /usr/local/sbin/pptpctrl to handle client
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: local address = 10.1.1.201
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: remote address = 10.1.1.221
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: pppd speed = 115200
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: Client 195.132.186.68 control
> connection started
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: Client 195.132.186.68 control
> connection started
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: Received PPTP Control Message
> (type: 1)
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: Made a START CTRL CONN RPLY
> packet
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: I wrote 156 bytes to the
> client.
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: Sent packet to client
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: Received PPTP Control Message
> (type: 7)
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: Set parameters to 0 maxbps,
16
> window size
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: Made a OUT CALL RPLY packet
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: Starting call (launching
pppd,
> opening GRE)
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: Starting call (launching
pppd,
> opening GRE)
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: pty_fd = 4
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: tty_fd = 5
> Nov 28 17:07:48 JIGAGate pptpd[24354]: CTRL (PPPD Launcher): Connection
> speed = 115200
> Nov 28 17:07:48 JIGAGate pptpd[24354]: CTRL (PPPD Launcher): local address
=
> 10.1.1.201
> Nov 28 17:07:48 JIGAGate pptpd[24354]: CTRL (PPPD Launcher): remote
address
> = 10.1.1.221
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: I wrote 32 bytes to the
client.
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: Sent packet to client
> Nov 28 17:07:48 JIGAGate pppd[24354]: pppd 2.4.1 started by root, uid 0
> Nov 28 17:07:48 JIGAGate pppd[24354]: pppd 2.4.1 started by root, uid 0
> Nov 28 17:07:48 JIGAGate pppd[24354]: Using interface ppp1
> Nov 28 17:07:48 JIGAGate pppd[24354]: Using interface ppp1
> Nov 28 17:07:48 JIGAGate pppd[24354]: Connect: ppp1 <--> /dev/pts/1
> Nov 28 17:07:48 JIGAGate pppd[24354]: Connect: ppp1 <--> /dev/pts/1
> Nov 28 17:07:48 JIGAGate pptpd[24353]: GRE:
> read(fd=5,buffer=bfffd680,len=8260) from network failed: status = -1 error
=
> Protocol no
> t available
> Nov 28 17:07:48 JIGAGate pptpd[24353]: GRE:
> read(fd=5,buffer=bfffd680,len=8260) from network failed: status = -1 error
=
> Protocol no
> t available
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: GRE read or PTY write failed
> (gre,pty)=(5,4)
> Nov 28 17:07:48 JIGAGate pptpd[24353]: CTRL: GRE read or PTY write failed
> (gre,pty)=(5,4)
> Nov 28 17:07:49 JIGAGate pptpd[24353]: CTRL: Client 195.132.186.68 control
> connection finished
> Nov 28 17:07:49 JIGAGate pptpd[24353]: CTRL: Client 195.132.186.68 control
> connection finished
> Nov 28 17:07:49 JIGAGate pppd[24354]: Modem hangup
> Nov 28 17:07:49 JIGAGate pppd[24354]: Modem hangup
> Nov 28 17:07:49 JIGAGate pptpd[24353]: CTRL: Exiting now
> Nov 28 17:07:49 JIGAGate pppd[24354]: Connection terminated.
>
> I've tried lot of parameters set on the win98 box without any change on
the
> result. The same with /etc/ppp/options.vpn or /etc/ppp/chap-secrets.
>
> TCPDUMP on ppp0 (ADSL interface) shows the following line when attempting
to
> connect from the win98 client :
> 17:13:28.321787 < r186m68.cybercable.tm.fr > 193.251.45.35: icmp:
> r186m68.cybercable.tm.fr protocol 47 unreachable [tos 0xc0]
>
> Note : cybercable is the FAI of the win98 box.
>
> I would greatly appreciate any help on that very painful case.
>
> THANKS !
>
> Ivan.
> imaillard at jiga.fr
>
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