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Sun Jul 8 18:14:56 CDT 2012 

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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> 
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