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


       pptp establishes the client side of a Virtual Private Net­
       work (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 connec­
       tion manager within pppd.


       The first argument on the pptp command line  must  be  the
       host  name  or  IP  address of the PPTP server.  Remaining
       arguments are checked for pptp options, and the  arguments
       from the first unrecognised option onward are passed as is
       to pppd unless --nolaunchpppd is given.

              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

       --phone number
              specifies the telephone number to place in the out­
              going PPTP call request packet.

       --localbind address
              optional binding to a particular local  IP  address
              on a multi-homed host.

       --quirks name
              adopts  special  case  handling for particular PPTP
              servers and ADSL modems.


              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 mppe-40 mppe-128 mppe-
       stateless name domain\\\\username remotename PPTP require-
       chapms-v2 pty "pptp --nolaunchpppd"

       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 2003):

       rx accepted
              the  number  of  GRE packets successfully passed to

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

       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 time­
              out 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 buffered for reordering

       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 protocol.

       rx acks
              the number of pure acknowledgements received (with­
              out 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

       round trip
              the estimated round-trip time in milliseconds



       Documentation in /usr/share/doc/pptp-linux


       This   manual   page   was   written   by   James  Cameron
       <james.cameron@hp.com> from  text  contributed  by  Thomas
       Quinot  <thomas@debian.org>, for the Debian GNU/Linux sys­
       tem.  The description  of  the  available  statistics  was
       written by Chris Wilson <chris@netservers.co.uk>.

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