Provided by: pptp-linux_1.7.0-1ubuntu1_i386 bug


       pptp - PPTP driver


       pptp <pptp-server-IP> <pptp-options> [ppp-options] ...


       pptp  establishes  the  client  side of a Virtual Private Network (VPN)
       using the Point-to-Point Tunneling Protocol (PPTP).  Use  this  program
       to  connect  to  an  employer’s PPTP based VPN, or to certain cable and
       ADSL service providers.

       By default, pptp establishes the PPTP call to the PPTP server, and then
       starts  an instance of pppd to manage the data transfer.  However, pptp
       can also be run as a connection manager within pppd.


       The first non-option argument on the pptp command line must be the host
       name or IP address of the PPTP server.

       All  long options (starting with "--") are interpreted as pptp options,
       and a fatal error occurs if an unrecognised option is used.

       All command-line arguments which do not start with "-" are  interpreted
       as  ppp  options,  and  passed  as  is to pppd unless --nolaunchpppd is

       --phone <number>
              Pass <number> to remote host as phone number

              Do not launch pppd but use stdin as the network connection.  Use
              this flag when including pptp as a pppd connection process using
              the pty option.  See EXAMPLES.

       --quirks <quirk>
              Work around a buggy PPTP  implementation,  adopts  special  case
              handling for particular PPTP servers and ADSL modems.  Currently
              recognised values are BEZEQ_ISRAEL only

              Run in foreground (for debugging with gdb)

       --sync Enable Synchronous HDLC (pppd must use it too)

       --timeout <secs>
              Time to wait for reordered packets (0.01 to 10 secs)

              Completely disables buffering and reordering  of  packets.   Any
              --timeout specified will be ignored.

       --idle-wait <secs>
              Time  to  wait before sending a control connection echo request.
              The RFC2637 default is 60 seconds.

       --max-echo-wait <secs>
              Time to wait for  an  echo  reply  before  closing  the  control
              connection.  The RFC2637 default is 60 seconds.

       --logstring <name>
              Use <name> instead of ’anon’ in syslog messages

       --localbind <addr>
              Bind to specified IP address instead of wildcard

       --loglevel <level>
              Sets the debugging level (0=low, 1=default, 2=high)


              modifies  packets to interoperate with Orckit ADSL modems on the
              BEZEQ network in Israel.


       Connection to a Microsoft Windows VPN Server

          pppd    noauth    nobsdcomp    nodeflate    require-mppe-128    name
       domain\\\\username remotename PPTP pty "pptp --nolaunchpppd"

       Note  that the chap-secrets file used by pppd must include an entry for


       The pptp process collects statistics when  sending  and  receiving  GRE
       packets.  They  are  intended  to  be  useful  for  debugging poor PPTP
       performance and for general monitoring of link quality. The  statistics
       are cumulative since the pptp process was started.

       The  statistics  can be viewed by sending a SIGUSR1 signal to the "GRE-
       to-PPP Gateway" process, which will cause it to dump them to the system
       logs  (at the LOG_NOTICE level). A better way to present the statistics
       to applications is being sought (e.g. SNMP?).

       The following statistics are collected at the time  of  writing  (April

       rx accepted
              the number of GRE packets successfully passed to PPP

       rx lost
              the  number  of packets never received, and presumed lost in the

       rx under win
              the number of packets which were duplicates or had old  sequence
              numbers  (this might be caused by a packet-reordering network if
              your reordering timeout is set too low)

       rx over win
              the number of packets which were too far ahead in  the  sequence
              to  be  reordered  (might  be  caused  by  loss of more than 300
              packets in a row)

       rx buffered
              the number of packets which were slightly ahead of sequence, and
              were   either  buffered  for  reordering,  or  if  buffering  is
              disabled, accepted immediately (resulting  in  the  intermediate
              packets being discarded).

       rx OS errors
              the number of times where the operating system reported an error
              when we tried to read a packet

       rx truncated
              the number of times we received a packet which was shorter  than
              the length implied by the GRE header

       rx invalid
              the  number  of  times we received a packet which had invalid or
              unsupported flags set in the header,  wrong  version,  or  wrong

       rx acks
              the number of pure acknowledgements received (without data). Too
              many of these will waste  bandwidth,  and  might  be  solved  by
              tuning the remote host.

       tx sent
              the number of GRE packets sent with data

       tx failed
              the  number  of packets we tried to send, but the OS reported an

       tx short
              the number of times the OS would not let  us  write  a  complete

       tx acks
              the number of times we sent a pure ack, without data

       tx oversize
              the  number  of  times  we couldn’t send a packet because it was
              over PACKET_MAX bytes long

       round trip
              the estimated round-trip time in milliseconds



       Documentation in /usr/share/doc/pptp


       This manual page was written by  James  Cameron  <>
       from  text  contributed  by  Thomas Quinot <>, for the
       Debian GNU/Linux system.  The description of the  available  statistics
       was  written  by Chris Wilson <>. Updates for the
       Debian distribution by Ola Lundqvist <>.