[pptp-server] Linux PoPToP 2.4 with LAN Internet connection.

Michael St. Laurent mikes at hartwellcorp.com
Wed Mar 6 17:01:06 CST 2002 

The Linux side is trying to setup the GRE connection but the other side
isn't responding to the parameter configuration requests.  The LCP ConfReq
packets should be getting back LCP ConfAck or LCP ConfNak packets but
instead nothing is received.  The call setup is not being completed and
that's why you never see any GRE.  Something appears to be wrong at the
other end.

-- 
Michael St. Laurent
Hartwell Corporation

> -----Original Message-----
> From: Allan Clark [mailto:allanc at caldera.com] 
> Sent: Wednesday, March 06, 2002 2:51 PM
> To: John Stephens
> Cc: PPTP List (E-mail)
> Subject: Re: [pptp-server] Linux PoPToP 2.4 with LAN Internet 
> connection.
> 
> 
> John;
> 
> From a quick look, it seems as though GRE packets are not being
> transferred.  I'm just going through the state machine in an idle
> manner, but you might want to see if there's a GRE-based ping 
> around...
> I think someone mentioned one a while ago.  It's as though GREs are
> being dropped by one of the "toasters" between you and the 
> PPTP server.
> 
> 
> My logic is as follows:
> 1) a connection is detected, pptpd becomes active
> 
> 2) pppd is launched, and pseudottys are created
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: Starting call 
> (launching pppd,
> > >opening GRE)
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: pty_fd = 5
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: tty_fd = 6
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: I wrote 32 bytes 
> to the client.
> > >Mar  6 16:04:14 slinux pptpd[833]: CTRL (PPPD Launcher): 
> Connection speed =
> > >115200
> > >Mar  6 16:04:14 slinux pptpd[833]: CTRL (PPPD Launcher): 
> local address =
> > >172.16.0.50
> > >Mar  6 16:04:14 slinux pptpd[833]: CTRL (PPPD Launcher): 
> remote address =
> > >192.168.0.1
> > >Mar  6 16:04:14 slinux pppd[833]: pppd 2.4.0 started by root, uid 0
> > >Mar  6 16:04:14 slinux pppd[833]: using channel 3
> > >Mar  6 16:04:14 slinux pppd[833]: Using interface ppp0
> > >Mar  6 16:04:14 slinux pppd[833]: Connect: ppp0 <--> /dev/pts/1
> 
> 3) pppd is connected via a pseudo tty, and begins sending information:
> > >Mar  6 16:04:14 slinux pppd[833]: sent [LCP ConfReq id=0x1 
> <asyncmap 0x0>
> 
> this last line is actually done 10 times (twice and 8 repeats, if you
> skip the pptpd log messages in the syslog).  This is a 
> typical PPP setup
> failure: 10 LCPs.  It's acting just as though pppd is talking 
> to a modem
> that isn't connected anywhere.
> 
> There's no indication that any GRE traffic is received and 
> unpacked for
> the pppd process -- only that GRE traffic is being sent.  
> ...so far as I
> know.  I don't think any GRE traffic has to be received before pppd is
> actually initiated.
> 
> Is it possible that intervening hosts are discarding GREs?
> 
> Allan
> 
> 
> John Stephens wrote:
> > 
> > I am not trying to get to an NT RRAS Server.  The Win2K is 
> the client and
> > Linux is Running POPToP Server with all the authentication 
> done there.  As I
> > said I can connect to it accross the local network but when 
> I go via the
> > internet I get halfway through the connection but the 
> tunnel isn't created.
> > I think it is a routing problem as I am using only one 
> interface eth0. The
> > linux logs seem to indicate that there is something coming 
> in from the
> > address that my ISP gave me when I dialed in (the 203 
> address) but then it
> > seems to lose track after the 192 address is given out to 
> create the tunnel.
> > The server localhost ip is the 172 address.
> > Any further thoughs
> > 
> > -----Original Message-----
> > From: Haruhiko Davis [mailto:htdconsultingsvs at hotmail.com]
> > Sent: Wednesday, 6 March 2002 4:56 p.m.
> > To: John.Stephens at smithscity.co.nz; pptp-server at lists.schulte.org
> > Subject: Re: [pptp-server] Linux PoPToP 2.4 with LAN Internet
> > connection.
> > 
> > Take a look at MS article Q227747.
> > 
> > And contrary to popular belief, you don't need to reboot 
> W2K (unlike the
> > Win9x clients). LOL
> > 
> > >Hi
> > >
> > >I have looked at all the how to's and been through the 
> archives but I must
> > >have missed something.
> > >I am trying to connect from win2k dial up to an ISP via a 
> VPN to a Linux
> > >PoPToP 2.4 on an intranet
> > >I can get it to work across the intranet so I presume the 
> security and
> > >logon
> > >settings are correct.
> > >
> > >This is the set up.
> > >
> > >Linux box Running PoPToP 2.4 with gateway pointing to 
> Firewall Router which
> > >then passes it on to an internal address to our ISP's 
> Linux firewall which
> > >does NAT and passes it on to the outside world.
> > >TCP 1723 and GRE are allowed  to pass on both routers.
> > >The Firewall Routers logs indicate both are passing 
> through it and it seems
> > >from the linux log to be getting 70% through verification and
> > >authentication
> > >before deciding that it does not want to continue.
> > >
> > >The Win2K side gives me a 619 error  Specified port is not 
> connected. and
> > >the helpful advice of try restarting.  Normal Windows Solution.
> > >
> > >Linux log
> > >
> > >Mar  6 16:04:14 slinux pptpd[832]: MGR: Launching 
> /usr/sbin/pptpctrl to
> > >handle client
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: local address = 
> 172.16.0.50
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: remote address = 
> 192.168.0.1
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: pppd speed = 115200
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: pppd options file =
> > >/etc/ppp/options
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: Client 
> 203.96.149.75 control
> > >connection started
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: Received PPTP 
> Control Message
> > >(type: 1)
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: Made a START CTRL 
> CONN RPLY packet
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: I wrote 156 bytes 
> to the client.
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: Sent packet to client
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: Received PPTP 
> Control Message
> > >(type: 7)
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: 0 min_bps, 1525 
> max_bps, 32 window
> > >size
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: Made a OUT CALL 
> RPLY packet
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: Starting call 
> (launching pppd,
> > >opening GRE)
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: pty_fd = 5
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: tty_fd = 6
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: I wrote 32 bytes 
> to the client.
> > >Mar  6 16:04:14 slinux pptpd[833]: CTRL (PPPD Launcher): 
> Connection speed =
> > >115200
> > >Mar  6 16:04:14 slinux pptpd[833]: CTRL (PPPD Launcher): 
> local address =
> > >172.16.0.50
> > >Mar  6 16:04:14 slinux pptpd[833]: CTRL (PPPD Launcher): 
> remote address =
> > >192.168.0.1
> > >Mar  6 16:04:14 slinux pppd[833]: pppd 2.4.0 started by root, uid 0
> > >Mar  6 16:04:14 slinux pppd[833]: using channel 3
> > >Mar  6 16:04:14 slinux pppd[833]: Using interface ppp0
> > >Mar  6 16:04:14 slinux pppd[833]: Connect: ppp0 <--> /dev/pts/1
> > >Mar  6 16:04:14 slinux pppd[833]: sent [LCP ConfReq id=0x1 
> <asyncmap 0x0>
> > ><auth chap MD5> <magic 0x252b63f> <pcomp> <accomp>]
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: Sent packet to client
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: Received PPTP 
> Control Message
> > >(type: 15)
> > >Mar  6 16:04:14 slinux pptpd[832]: CTRL: Got a SET LINK 
> INFO packet with
> > >standard ACCMs
> > >Mar  6 16:04:17 slinux pppd[833]: sent [LCP ConfReq id=0x1 
> <asyncmap 0x0>
> > ><auth chap MD5> <magic 0x252b63f> <pcomp> <accomp>]
> > >Mar  6 16:04:41 slinux last message repeated 8 times
> > >Mar  6 16:04:44 slinux pppd[833]: LCP: timeout sending 
> Config-Requests
> > >Mar  6 16:04:44 slinux pppd[833]: Connection terminated.
> > >Mar  6 16:04:44 slinux pppd[833]: Couldn't release PPP 
> unit: Inappropriate
> > >ioctl for device
> > >Mar  6 16:04:44 slinux pppd[833]: Exit.
> > >Mar  6 16:04:44 slinux pptpd[832]: Error reading from 
> pppd: Input/output
> > >error
> > >Mar  6 16:04:44 slinux pptpd[832]: CTRL: GRE read or PTY 
> write failed
> > >(gre,pty)=(6,5)
> > >Mar  6 16:04:44 slinux pptpd[832]: CTRL: Client 
> 203.96.149.75 control
> > >connection finished
> > >Mar  6 16:04:44 slinux pptpd[832]: CTRL: Exiting now
> > >Mar  6 16:04:44 slinux pptpd[249]: MGR: Reaped child 832
> > >
> > >The 203.96.149.75 address is the one given to the Win2K PC 
> dialing in to
> > >the
> > >Internet.
> > >
> > >As there is no modem ISDN etc connection is there 
> something that I have
> > >missed with the PPP setup
> > >
> > >I'm relatively new to Linux so more detail than less would 
> be helpful.
> > >
> > >Thanks John
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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