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<HTML>
<HEAD>
<TITLE>Setting up a Linux PPTP Client with WinNT PPTP Server</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF">
<H1>Setting up the Linux PPTP 1.0.2 client (and PPP 2.3.5) with Windows NT PPTP Server</H1>
<HR>
<A NAME="aboutsys"></A>
<H2>About the systems</H2>
<P>
This document assumes the following:
<ul>
<li>remote machine name = orge
<li>domain remote machine belongs to = gnoll
<li>username on remote machine = billybob
<li>password for billybob = bobbybill
</ul>
We want to connect our local machine to the remote machine using PPTP. The
remote machine is a <I>Windows NT</I> box while our local machine is a
<I>Linux box</I>.
</P>
<HR>
<A NAME="chapsecrets"></A>
<H2>PPP chap-secrets file</H2>
<P>
Find the <I>chap-secrets</I> file which should be in <I>/etc/ppp/</I>. This
file should look like this:
</P>
<P>
<TABLE>
<TR><TD># chap-secrets</TD></TR><TR>
<TD># client</TD><TD>server</TD><TD>secret</TD><TD>IP adresses</TD></TR><TR>
<TD>gnoll\\billybob</TD><TD>orge</TD><TD>bobbybill</TD><TD></TD></TR>
</TABLE>
</P>
<HR>
<A NAME="debugging"></A>
<H2>Setting up PPP debugging</H2>
<P>
PPP debugging is handled by <I>syslogd</I>. To setup debugging open
<I>syslog.conf</I> which should be found in <I>/etc/</I> and add the following
entry:
</P>
<P>
<B>daemon.debug /var/log/pppd.log</B>
</P>
<HR>
<A NAME="launchpptp"></A>
<H2>Launching PPTP</H2>
<P>
The following command is issued on the linux box to connect to the remote NT
machine.
</P>
<P>
<B>pptp orge debug name gnoll\\billybob remotename orge</B>
</P>
<HR>
<A NAME="errors"></A>
<H2>Errors</H2>
<P>
<B>E=691</B><BR>
This error occurs when you supply an incorrect username/password to the remote
NT machine. Check the chap-secrets file and the command line where PPTP is
launched.
</P>
<HR>
<A NAME="testing"></A>
<H2>Testing</H2>
<P>
<ul>
<li> run 'ifconfig' and check that a ppp0 interface exists
<li> find P-t-P: xxx.xxx.xxx.xxx from the output of ifconfig
<li> run 'netstat -i' and record the RX-OK and TX-OK values for ppp0
<li> type 'ping xxx.xxx.xxx.xxx'
<li> run 'netstat -i' again and see if the values for RX and TX increased.. if yes then it would appear to be working ok....... in theory anyway.
</ul>
<HR>
<A HREF="http://www.moretonbay.com/vpn/pptp.html">PoPToP Home Page</a>
</BODY>
</HTML>
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