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731 lines
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HTML
731 lines
22 KiB
HTML
<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
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<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
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<meta name="ProgId" content="FrontPage.Editor.Document">
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<title>Shorewall PPTP</title>
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<meta name="Microsoft Theme" content="boldstri 011, default">
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</head>
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<body>
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<h1 align="center">PPTP</h1>
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<p align="left">Shorewall easily supports PPTP in a number of configurations:</p>
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<ul>
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<li>
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<a href="#ServerFW">PPTP Server running on your Firewall</a></li>
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<li>
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<a href="#ServerBehind">PPTP Server running behind your
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Firewall.</a></li>
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<li>
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<a href="#ClientsBehind">PPTP Clients running behind your
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Firewall.</a></li>
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<li>
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<a href="#ClientFW">PPTP Client running on your Firewall.</a></li>
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</ul>
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<h2 align="center"><a name="ServerFW"></a>1. PPTP Server Running on your Firewall</h2>
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<p>I will try to give you an idea of how to set up a PPTP server
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on your firewall system. This isn't a detailed HOWTO but rather an example of
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how I have set up a working PPTP server on my own firewall.</p>
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<p>The steps involved are:</p>
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<ol>
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<li><a href="#PatchPppd">Patching and building pppd</a></li>
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<li><a href="#PatchKernel">Patching and building your Kernel</a></li>
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<li><a href="#Samba">Configuring Samba</a></li>
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<li><a href="#ConfigPppd">Configuring pppd</a></li>
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<li><a href="#ConfigPptpd">Configuring pptpd</a></li>
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<li><a href="#ConfigFw">Configuring Shorewall</a></li>
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</ol>
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<h3><a name="PatchPppd"></a>Patching and Building pppd</h3>
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<p>To run pppd on a 2.4 kernel, you need the pppd 2.4.1 or later. The primary
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site for releases of pppd is <a href="ftp://ftp.samba.org/pub/ppp">ftp://ftp.samba.org/pub/ppp</a>.</p>
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<p>You will need the following patches:</p>
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<ul>
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<li>
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<a href="http://www.shorewall.net/pub/shorewall/pptp/ppp-2.4.1-openssl-0.9.6-mppe-patch.gz">http://www.shorewall.net/pub/shorewall/pptp/ppp-2.4.1-openssl-0.9.6-mppe-patch.gz</a></li>
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<li><a href="http://www.shorewall.net/pub/shorewall/pptp/ppp-2.4.1-MSCHAPv2-fix.patch.gz">http://www.shorewall.net/pub/shorewall/pptp/ppp-2.4.1-MSCHAPv2-fix.patch.gz</a></li>
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</ul>
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<p>You may also want the following patch if you want to require remote hosts to
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use encryption:</p>
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<ul>
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<li><a href="ftp://ftp.shorewall.net/pub/shorewall/pptp/require-mppe.diff">ftp://ftp.shorewall.net/pub/shorewall/pptp/require-mppe.diff</a></li>
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</ul>
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<p>Un-tar the pppd source and uncompress the patches into one directory (the
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patches and the ppp-2.4.1 directory are all in a single parent directory):</p>
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<ul>
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<li>cd ppp-2.4.1</li>
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<li>patch -p1 < ../ppp-2.4.0-openssl-0.9.6-mppe.patch</li>
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<li>patch -p1 < ../ppp-2.4.1-MSCHAPv2-fix.patch</li>
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<li>(Optional) patch -p1 < ../require-mppe.diff</li>
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<li>./configure</li>
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<li>make</li>
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</ul>
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<p>You will need to install the resulting binary on your firewall system. To do
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that, I NFS mount my source filesystem and use "make install" from the
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ppp-2.4.1 directory.</p>
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<h3><a name="PatchKernel"></a>Patching and Building your Kernel</h3>
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<p>You will need one of the following patches depending on your kernel version:</p>
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<ul>
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<li>
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<a href="http://www.shorewall.net/pub/shorewall/pptp/linux-2.4.4-openssl-0.9.6a-mppe-patch.gz">http://www.shorewall.net/pub/shorewall/pptp/linux-2.4.4-openssl-0.9.6a-mppe-patch.gz</a></li>
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<li>
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<a href="http://www.shorewall.net/pub/shorewall/pptp/linux-2.4.16-openssl-0.9.6b-mppe-patch.gz">http://www.shorewall/net/pub/shorewall/pptp/linux-2.4.16-openssl-0.9.6b-mppe-patch.gz</a></li>
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</ul>
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<p>Uncompress the patch into the same directory where your top-level kernel
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source is located and:</p>
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<ul>
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<li>cd <your GNU/Linux source top-level directory></li>
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<li>patch -p1 < ../linux-2.4.16-openssl-0.9.6b-mppe.patch</li>
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</ul>
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<p>Now configure your kernel. Here is my ppp configuration:</p>
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<blockquote>
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<p><img border="0" src="images/ppp.jpg" width="592" height="734"></p>
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</blockquote>
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<h3><a name="Samba"></a>Configuring Samba</h3>
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<p>You will need a WINS server (Samba configured to run as a WINS server is
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fine). Global section from /etc/samba/smb.conf on my WINS server (192.168.1.3) is:</p>
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<blockquote>
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<pre>[global]
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workgroup = TDM-NSTOP
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netbios name = WOOKIE
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server string = GNU/Linux Box
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encrypt passwords = Yes
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log file = /var/log/samba/%m.log
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max log size = 0
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socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
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os level = 65
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domain master = True
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preferred master = True
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dns proxy = No
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wins support = Yes
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printing = lprng
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[homes]
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comment = Home Directories
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valid users = %S
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read only = No
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create mask = 0664
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directory mask = 0775
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[printers]
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comment = All Printers
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path = /var/spool/samba
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printable = Yes</pre>
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</blockquote>
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<h3><a name="ConfigPppd"></a>Configuring pppd</h3>
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<p>Here is a copy of my /etc/ppp/options.poptop file:</p>
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<blockquote>
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<p><font face="Courier" size="2">ipparam PoPToP<br>
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lock<br>
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mtu 1490<br>
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mru 1490<br>
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ms-wins 192.168.1.3<br>
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ms-dns 206.124.146.177<br>
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multilink<br>
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proxyarp<br>
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auth<br>
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+chap<br>
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+chapms<br>
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+chapms-v2<br>
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ipcp-accept-local<br>
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ipcp-accept-remote<br>
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lcp-echo-failure 30<br>
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lcp-echo-interval 5<br>
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deflate 0<br>
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mppe-128<br>
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mppe-stateless<br>
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require-mppe<br>
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require-mppe-stateless</font></p>
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</blockquote>
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<p>Notes:</p>
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<ul>
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<li>Since the firewall itself is acting as a WINS server, I have included the
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firewall's internal IP as the 'ms-wins' value.</li>
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<li>I have pointed the remote clients at my DNS server -- it has external
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address 206.124.146.177.</li>
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<li>I am requiring 128-bit stateless compression (my kernel is built with the
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'require-mppe.diff' patch mentioned above.</li>
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</ul>
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<p>Here's my /etc/ppp/chap-secrets:</p>
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<blockquote>
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<p><font face="Courier" size="2"> Secrets for authentication using CHAP<br>
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# client server secret
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IP addresses<br>
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CPQTDM\\TEastep * <shhhhhh>
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192.168.1.7<br>
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TEastep *
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<shhhhhh> 192.168.1.7</font></p>
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</blockquote>
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<p>I am the only user who connects to the server but I may connect either with
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or without a domain being specified. The system I connect from is my laptop so I
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give it the same IP address when tunneled in as it has when it is in its docking
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station.</p>
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<p>You will also want the following in /etc/modules.conf:</p>
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<pre> alias ppp-compress-18 ppp_mppe
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alias ppp-compress-21 bsd_comp
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alias ppp-compress-24 ppp_deflate
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alias ppp-compress-26 ppp_deflate</pre>
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<h3><a name="ConfigPptpd"></a>Configuring pptpd</h3>
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<p>PoPTop (pptpd) is available from <a href="http://poptop.lineo.com/">http://poptop.lineo.com/</a>.</p>
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<p>Here is a copy of my /etc/pptpd.conf file:</p>
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<blockquote>
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<p><font face="Courier" size="2">option /etc/ppp/options.poptop<br>
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speed 115200<br>
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localip 192.168.1.254<br>
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remoteip 192.168.1.33-38</font></p>
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</blockquote>
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<p>Notes:</p>
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<ul>
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<li>I specify the /etc/ppp/options.poptop file as my ppp options file (I have
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several).</li>
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<li>The local IP is the same as my internal interface's (192.168.1.254).</li>
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<li>I have assigned a remote IP range that overlaps my local network. This,
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together with 'proxyarp' in my /etc/ppp/options.poptop file make the remote
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hosts look like they are part of the local subnetwork.</li>
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</ul>
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<p>I use this file to start/stop pptpd -- I have this in /etc/init.d/pptpd:</p>
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<blockquote>
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<p><font face="Courier" size="2">#!/bin/sh<br>
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#<br>
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# /etc/rc.d/init.d/pptpd<br>
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#<br>
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# chkconfig: 5 12 85<br>
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# description: control pptp server<br>
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#<br>
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<br>
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case "$1" in<br>
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start)<br>
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echo 1 > /proc/sys/net/ipv4/ip_forward<br>
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modprobe ppp_async<br>
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modprobe ppp_generic<br>
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modprobe ppp_mppe<br>
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modprobe slhc<br>
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if /usr/local/sbin/pptpd; then<br>
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touch /var/lock/subsys/pptpd<br>
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fi<br>
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;;<br>
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stop)<br>
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killall pptpd<br>
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rm -f /var/lock/subsys/pptpd<br>
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;;<br>
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restart)<br>
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killall pptpd<br>
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if /usr/local/sbin/pptpd; then<br>
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touch /var/lock/subsys/pptpd<br>
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fi<br>
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;;<br>
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status)<br>
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ifconfig<br>
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;;<br>
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*)<br>
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echo "Usage: $0 {start|stop|restart|status}"<br>
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;;<br>
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esac</font></p>
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</blockquote>
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<h3><a name="ConfigFw"></a>Configuring Shorewall</h3>
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<p>I consider hosts connected to my PPTP server to be just like local systems.
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My key Shorewall entries are:</p>
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<h4>/etc/shorewall/zones:</h4>
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<blockquote>
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<table border="2" cellpadding="2" style="border-collapse: collapse">
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<tr>
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<td><b>ZONE</b></td>
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<td><b>DISPLAY</b></td>
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<td><b>COMMENTS</b></td>
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</tr>
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<tr>
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<td>net</td>
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<td>Internet</td>
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<td>The Internet</td>
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</tr>
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<tr>
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<td>loc</td>
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<td>Local</td>
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<td>My Local Network including remote PPTP clients</td>
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</tr>
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</table>
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</blockquote>
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<h4>/etc/shorewall/interfaces:</h4>
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<blockquote>
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<table border="2" cellpadding="2" style="border-collapse: collapse">
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<tr>
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<td><b>ZONE</b></td>
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<td><b>INTERFACE</b></td>
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<td><b>BROADCAST</b></td>
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<td><b>OPTIONS</b></td>
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</tr>
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<tr>
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<td>net</td>
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<td>eth0</td>
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<td>206.124.146.255</td>
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<td>noping,norfc1918</td>
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</tr>
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<tr>
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<td>loc</td>
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<td>eth2</td>
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<td>192.168.1.255</td>
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<td> </td>
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</tr>
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<tr>
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<td>-</td>
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<td>ppp+</td>
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<td> </td>
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<td> </td>
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</tr>
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</table>
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</blockquote>
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<h4>/etc/shorewall/hosts:</h4>
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<blockquote>
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<table border="2" cellpadding="2" style="border-collapse: collapse">
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<tr>
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<td><b>ZONE</b></td>
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<td><b>HOST(S)</b></td>
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<td><b>OPTIONS</b></td>
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</tr>
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<tr>
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<td>loc</td>
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<td>eth2:192.168.1.0/24</td>
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<td>routestopped</td>
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</tr>
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<tr>
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<td>loc</td>
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<td>ppp+:192.168.1.0/24</td>
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<td> </td>
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</tr>
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</table>
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</blockquote>
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<h4>/etc/shorewall/policy:</h4>
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<blockquote>
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<table border="2" cellpadding="2" style="border-collapse: collapse">
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<tr>
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<td><b>SOURCE</b></td>
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<td><b>DEST</b></td>
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<td><b>POLICY</b></td>
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<td><b>LOG LEVEL</b></td>
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</tr>
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<tr>
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<td>loc</td>
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<td>loc</td>
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<td>ACCEPT</td>
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<td> </td>
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</tr>
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</table>
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</blockquote>
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<h4>/etc/shorewall/rules:</h4>
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<blockquote>
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<table border="2" cellpadding="2" style="border-collapse: collapse">
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<tr>
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<font face="Century Gothic, Arial, Helvetica">
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<td><b>ACTION</b></td>
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<td><b>SOURCE</b></td>
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<td><b>DEST</b></td>
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<td><b>
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PROTO</b></td>
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<td><b>DEST<br>
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PORT(S)</b></td>
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<td><b>SOURCE<br>
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PORT(S)</b></td>
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<td><b>ORIGINAL<br>
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DEST</b></td>
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</font>
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</tr>
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<tr>
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<td>ACCEPT</td>
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<td>net</td>
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<td>fw</td>
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<td>tcp</td>
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<td>1723</td>
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<td> </td>
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<td> </td>
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</tr>
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<tr>
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<td>ACCEPT</td>
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<td>net</td>
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<td>fw</td>
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<td>47</td>
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<td>-</td>
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<td> </td>
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<td> </td>
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</tr>
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<tr>
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<td>ACCEPT</td>
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<td>fw</td>
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<td>net</td>
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<td>47</td>
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<td>-</td>
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<td> </td>
|
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<td> </td>
|
||
</tr>
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</table>
|
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</blockquote>
|
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<p align="left">Note: I have multiple ppp interfaces on my firewall. If you
|
||
have a single ppp interface, you probably want:</p>
|
||
<h4>/etc/shorewall/interfaces:</h4>
|
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<blockquote>
|
||
<table border="2" cellpadding="2" style="border-collapse: collapse">
|
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<tr>
|
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<td><b>ZONE</b></td>
|
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<td><b>INTERFACE</b></td>
|
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<td><b>BROADCAST</b></td>
|
||
<td><b>OPTIONS</b></td>
|
||
</tr>
|
||
<tr>
|
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<td>net</td>
|
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<td>eth0</td>
|
||
<td>206.124.146.255</td>
|
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<td>noping,norfc1918</td>
|
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</tr>
|
||
<tr>
|
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<td>loc</td>
|
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<td>eth2</td>
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<td>192.168.1.255</td>
|
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<td> </td>
|
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</tr>
|
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<tr>
|
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<td>loc</td>
|
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<td>ppp0</td>
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<td> </td>
|
||
<td> </td>
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||
</tr>
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||
</table>
|
||
</blockquote>
|
||
<p align="left">and <u><b>no</b></u> entries in /etc/shorewall/hosts.</p>
|
||
<h2 align="center"><a name="ServerBehind"></a>2. PPTP Server Running Behind your Firewall</h2>
|
||
<p>If you have a single external IP address, add the following to your
|
||
/etc/shorewall/rules file:</p>
|
||
<table border="2" cellpadding="2" style="border-collapse: collapse">
|
||
<tr>
|
||
<font face="Century Gothic, Arial, Helvetica">
|
||
<td><b>ACTION</b></td>
|
||
<td><b>SOURCE</b></td>
|
||
<td><b>DEST</b></td>
|
||
<td><b>
|
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PROTO</b></td>
|
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<td><b>DEST<br>
|
||
PORT(S)</b></td>
|
||
<td><b>SOURCE<br>
|
||
PORT(S)</b></td>
|
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<td><b>ORIGINAL<br>
|
||
DEST</b></td>
|
||
</font>
|
||
</tr>
|
||
<tr>
|
||
<td>DNAT</td>
|
||
<td>net</td>
|
||
<td>loc:<i><server address></i></td>
|
||
<td>tcp</td>
|
||
<td>1723</td>
|
||
<td> </td>
|
||
<td> </td>
|
||
</tr>
|
||
<tr>
|
||
<td>DNAT</td>
|
||
<td>net</td>
|
||
<td>loc:<i><server address></i></td>
|
||
<td>47</td>
|
||
<td>-</td>
|
||
<td> </td>
|
||
<td> </td>
|
||
</tr>
|
||
</table>
|
||
<p>If you have multiple external IP address and you want to forward a single <i><external
|
||
address>, </i>add the following to your /etc/shorewall/rules file:<p> <table border="2" cellpadding="2" style="border-collapse: collapse">
|
||
<tr>
|
||
<font face="Century Gothic, Arial, Helvetica">
|
||
<td><b>ACTION</b></td>
|
||
<td><b>SOURCE</b></td>
|
||
<td><b>DEST</b></td>
|
||
<td><b>
|
||
PROTO</b></td>
|
||
<td><b>DEST<br>
|
||
PORT(S)</b></td>
|
||
<td><b>SOURCE<br>
|
||
PORT(S)</b></td>
|
||
<td><b>ORIGINAL<br>
|
||
DEST</b></td>
|
||
</font>
|
||
</tr>
|
||
<tr>
|
||
<td>DNAT</td>
|
||
<td>net</td>
|
||
<td>loc:<i><server address></i></td>
|
||
<td>tcp</td>
|
||
<td>1723</td>
|
||
<td>-</td>
|
||
<td><i><external address></i></td>
|
||
</tr>
|
||
<tr>
|
||
<td>DNAT</td>
|
||
<td>net</td>
|
||
<td>loc:<i><server address></i></td>
|
||
<td>47</td>
|
||
<td>-</td>
|
||
<td>-</td>
|
||
<td><i><external address></i></td>
|
||
</tr>
|
||
</table>
|
||
<h2 align="center"><a name="ClientsBehind"></a>3. PPTP Clients Running Behind your Firewall</h2>
|
||
<p>You shouldn't have to take any special action for this case unless you wish
|
||
to connect multiple clients to the same external server. In that case, you will
|
||
need to follow the instructions at <a href="http://www.impsec.org/linux/masquerade/ip_masq_vpn.html">http://www.impsec.org/linux/masquerade/ip_masq_vpn.html</a>.
|
||
I recommend that you also add these two lines to your /etc/shorewall/modules
|
||
file:
|
||
<blockquote>
|
||
<p>loadmodule ip_conntrack_pptp<br>
|
||
loadmodule ip_nat_pptp
|
||
</blockquote>
|
||
<h2 align="center"><a name="ClientFW"></a>4. PPTP Client Running on your Firewall.</h2>
|
||
<p align="left">The PPTP GNU/Linux client is available at <a href="http://sourceforge.net/projects/pptpclient/">http://sourceforge.net/projects/pptpclient/</a>.
|
||
Rather than use the configuration script that comes with the client, I built my
|
||
own. I also build my own kernel <a href="#PatchKernel">as described above</a>
|
||
rather than using the mppe package that is available with the client. My
|
||
/etc/ppp/options file is mostly unchanged from what came with the client (see
|
||
below).</p>
|
||
<p>The key elements of this setup are as follows:
|
||
<ol>
|
||
<li>Define a zone for the remote network accessed via PPTP.</li>
|
||
<li>Associate that zone with a ppp interface.</li>
|
||
<li>Define rules for PPTP traffic to/from the firewall.</li>
|
||
<li>Define rules for traffic two and from the remote zone.</li>
|
||
</ol>
|
||
<p>Here are examples from my setup:</p>
|
||
<h4>/etc/shorewall/zones</h4>
|
||
<blockquote>
|
||
<table border="2" cellpadding="2" style="border-collapse: collapse">
|
||
<tr>
|
||
<td><b>ZONE</b></td>
|
||
<td><b>DISPLAY</b></td>
|
||
<td><b>COMMENTS</b></td>
|
||
</tr>
|
||
<tr>
|
||
<td>cpq</td>
|
||
<td>Compaq</td>
|
||
<td>Compaq Intranet</td>
|
||
</tr>
|
||
</table>
|
||
</blockquote>
|
||
<h4>/etc/shorewall/interfaces</h4>
|
||
<blockquote>
|
||
<table border="2" cellpadding="2" style="border-collapse: collapse">
|
||
<tr>
|
||
<td><b>ZONE</b></td>
|
||
<td><b>INTERFACE</b></td>
|
||
<td><b>BROADCAST</b></td>
|
||
<td><b>OPTIONS</b></td>
|
||
</tr>
|
||
<tr>
|
||
<td>-</td>
|
||
<td>ppp+</td>
|
||
<td> </td>
|
||
<td> </td>
|
||
</tr>
|
||
</table>
|
||
</blockquote>
|
||
<h4>/etc/shorewall/hosts</h4>
|
||
<blockquote>
|
||
<table border="2" cellpadding="2" style="border-collapse: collapse">
|
||
<tr>
|
||
<td><b>ZONE</b></td>
|
||
<td><b>HOST(S)</b></td>
|
||
<td><b>OPTIONS</b></td>
|
||
</tr>
|
||
<tr>
|
||
<td>-</td>
|
||
<td>ppp+:!192.168.1.0/24</td>
|
||
<td> </td>
|
||
</tr>
|
||
</table>
|
||
</blockquote>
|
||
<h4>/etc/shorewall/rules</h4>
|
||
<blockquote>
|
||
<table border="2" cellpadding="2" style="border-collapse: collapse">
|
||
<tr>
|
||
<font face="Century Gothic, Arial, Helvetica">
|
||
<td><b>ACTION</b></td>
|
||
<td><b>SOURCE</b></td>
|
||
<td><b>DEST</b></td>
|
||
<td><b>
|
||
PROTO</b></td>
|
||
<td><b>DEST<br>
|
||
PORT(S)</b></td>
|
||
<td><b>SOURCE<br>
|
||
PORT(S)</b></td>
|
||
<td><b>ORIGINAL<br>
|
||
DEST</b></td>
|
||
</font>
|
||
</tr>
|
||
<tr>
|
||
<td>ACCEPT</td>
|
||
<td>fw</td>
|
||
<td>net</td>
|
||
<td>tcp</td>
|
||
<td>1723</td>
|
||
<td> </td>
|
||
<td> </td>
|
||
</tr>
|
||
<tr>
|
||
<td>ACCEPT</td>
|
||
<td>fw</td>
|
||
<td>net</td>
|
||
<td>47</td>
|
||
<td>-</td>
|
||
<td> </td>
|
||
<td> </td>
|
||
</tr>
|
||
</table>
|
||
</blockquote>
|
||
<p>I use the combination of interface and hosts file to define the 'cpq' zone
|
||
because I also run a PPTP server on my firewall (see above). Using this
|
||
technique allows me to distinguish clients of my own PPTP server from arbitrary
|
||
hosts at Compaq; I assign addresses in 192.168.1.0/24 to my PPTP clients and
|
||
Compaq doesn't use that RFC1918 Class C subnet.
|
||
<p>I use this script in /etc/init.d to control the client. The reason that I
|
||
disable ECN when connecting is that the Compaq tunnel servers don't do ECN yet
|
||
and reject the initial TCP connection request if I enable ECN :-(
|
||
<blockquote>
|
||
<p><font face="Courier" size="2">#!/bin/sh<br>
|
||
#<br>
|
||
# /etc/rc.d/init.d/pptp<br>
|
||
#<br>
|
||
# chkconfig: 5 60 85<br>
|
||
# description: PPTP Link Control<br>
|
||
#<br>
|
||
NAME="Tandem"<br>
|
||
ADDRESS=tunnel-tandem.compaq.com<br>
|
||
USER='Tandem\tommy'<br>
|
||
ECN=0<br>
|
||
DEBUG=<br>
|
||
<br>
|
||
start_pptp() {<br>
|
||
echo $ECN > /proc/sys/net/ipv4/tcp_ecn<br>
|
||
if /usr/sbin/pptp $ADDRESS user $USER noauth $DEBUG; then<br>
|
||
touch /var/lock/subsys/pptp<br>
|
||
echo "PPTP Connection to $NAME Started"<br>
|
||
fi<br>
|
||
}<br>
|
||
<br>
|
||
stop_pptp() {<br>
|
||
if killall /usr/sbin/pptp 2> /dev/null; then<br>
|
||
echo "Stopped pptp"<br>
|
||
else<br>
|
||
rm -f /var/run/pptp/*<br>
|
||
fi<br>
|
||
<br>
|
||
# if killall pppd; then<br>
|
||
# echo "Stopped pppd"<br>
|
||
# fi<br>
|
||
<br>
|
||
rm -f /var/lock/subsys/pptp<br>
|
||
<br>
|
||
echo 1 > /proc/sys/net/ipv4/tcp_ecn<br>
|
||
}<br>
|
||
<br>
|
||
<br>
|
||
case "$1" in<br>
|
||
start)<br>
|
||
echo "Starting PPTP Connection to ${NAME}..."<br>
|
||
start_pptp<br>
|
||
;;<br>
|
||
stop)<br>
|
||
echo "Stopping $NAME PPTP Connection..."<br>
|
||
stop_pptp<br>
|
||
;;<br>
|
||
restart)<br>
|
||
echo "Restarting $NAME PPTP Connection..."<br>
|
||
stop_pptp<br>
|
||
start_pptp<br>
|
||
;;<br>
|
||
status)<br>
|
||
ifconfig<br>
|
||
;;<br>
|
||
*)<br>
|
||
echo "Usage: $0 {start|stop|restart|status}"<br>
|
||
;;<br>
|
||
esac<br>
|
||
</font>
|
||
</blockquote>
|
||
<p>Here's my /etc/ppp/options file:
|
||
<blockquote>
|
||
<p><font face="Courier" size="2">#<br>
|
||
# Identify this connection<br>
|
||
#<br>
|
||
ipparam Compaq<br>
|
||
#<br>
|
||
# Lock the port<br>
|
||
#<br>
|
||
lock<br>
|
||
#<br>
|
||
# We don't need the tunnel server to authenticate itself<br>
|
||
#<br>
|
||
noauth<br>
|
||
<br>
|
||
+chap<br>
|
||
+chapms<br>
|
||
+chapms-v2<br>
|
||
<br>
|
||
multilink<br>
|
||
mrru 1614<br>
|
||
#<br>
|
||
# Turn off transmission protocols we know won't be used<br>
|
||
#<br>
|
||
nobsdcomp<br>
|
||
nodeflate<br>
|
||
<br>
|
||
#<br>
|
||
# We want MPPE<br>
|
||
#<br>
|
||
mppe-128<br>
|
||
mppe-stateless<br>
|
||
<br>
|
||
#<br>
|
||
# We want a sane mtu/mru<br>
|
||
#<br>
|
||
mtu 1000<br>
|
||
mru 1000<br>
|
||
<br>
|
||
#<br>
|
||
# Time this thing out of it goes poof<br>
|
||
#<br>
|
||
lcp-echo-failure 10<br>
|
||
lcp-echo-interval 10</font>
|
||
</blockquote>
|
||
<p>My /etc/ppp/ip-up.local file sets up the routes that I need to route Compaq
|
||
traffic through the PPTP tunnel:
|
||
<blockquote>
|
||
<p><font face="Courier" size="2">#/bin/sh<br>
|
||
<br>
|
||
case $6 in<br>
|
||
Compaq)<br>
|
||
route add -net 16.0.0.0 netmask 255.0.0.0 gw $5 $1<br>
|
||
route add -net 130.252.0.0 netmask 255.255.0.0 gw $5 $1<br>
|
||
route add -net 131.124.0.0 netmask 255.255.0.0 gw $5 $1<br>
|
||
...<br>
|
||
;;<br>
|
||
esac</font></blockquote>
|
||
<p>Finally, I run the following script every five minutes under crond to
|
||
restart the tunnel if it fails:<pre> #!/bin/sh
|
||
restart_pptp() {
|
||
/sbin/service pptp stop
|
||
sleep 10
|
||
if /sbin/service pptp start; then
|
||
/usr/bin/logger "PPTP Restarted"
|
||
fi
|
||
}
|
||
|
||
if [ -n "`ps ax | grep /usr/sbin/pptp | grep -v grep`" ]; then
|
||
exit 0
|
||
fi
|
||
|
||
echo "Attempting to restart PPTP"
|
||
|
||
restart_pptp > /dev/null 2>&1 &
|
||
</pre>
|
||
<p><a href="ftp://ftp.shorewall.net/pub/shorewall/misc/Vonau">Here's a script
|
||
and corresponding ip-up.local </a>from <a href="mailto:jvonau@home.com">Jerry
|
||
Vonau </a>that controls two PPTP connections.</p>
|
||
<p><font size="2">Last modified 7/11/2002 - <a href="support.htm">Tom
|
||
Eastep</a></font><p><font face="Trebuchet MS"><a href="copyright.htm">
|
||
<font size="2">Copyright</font> <20> <font size="2">2001, 2002 Thomas M. Eastep.</font></a></font></body></html> |