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+PingTunnel Read Me
+==================
+
+What is ptunnel?
+----------------
+Ptunnel is an application that allows you to reliably tunnel TCP connections
+to a remote host using ICMP echo request and reply packets, commonly known as
+ping requests and replies.
+
+
+Contact details
+---------------
+You can the author, Daniel Stoedle, here:
+   <daniels@cs.uit.no>
+The official ptunnel website is located here:
+   <http://www.cs.uit.no/~daniels/PingTunnel/>
+The Windows port was created by Mike Miller:
+   <mike@mikeage.net>
+
+
+Compiling
+---------
+To compile ptunnel, simply run make. If everything goes well, you should end up
+with a binary called ptunnel. This serves as both the client and proxy. You can
+optionally install it using "make install". On Windows, run "make ptunnel.exe"
+to compile the Windows binary. You will need mingw installed, as well as the
+WinPcap library. WinPcap is available here:
+  <http://www.winpcap.org/install/bin/WpdPack_4_0_2.zip>
+
+
+Running
+-------
+Ptunnel works best when running as root, and usually requires running as root.
+Again, from the website:
+
+Client: ./ptunnel -p <proxy address> -lp <listen port> -da <destination address>
+                  -dp <dest port> [-c <network device>] [-v <verbosity>] [-u]
+                  [-x password]
+Proxy: ./ptunnel [-c <network device>] [-v <verbosity>] [-u] [-x password]
+
+The -p switch sets the address of the host on which the proxy is running. A
+quick test to see if the proxy will work is simply to try pinging this host -
+if you get replies, you should be able to make the tunnel work.
+
+The -lp, -da and -dp switches set the local listening port, destination address
+and destination port. For instance, to tunnel ssh connections from the client
+machine via a proxy running on proxy.pingtunnel.com to the computer
+login.domain.com, the following command line would be used:
+
+sudo ./ptunnel -p proxy.pingtunnel.com -lp 8000 -da login.domain.com -dp 22
+
+An ssh connection to login.domain.com can now be established as follows:
+
+ssh -p 8000 localhost
+
+If ssh complains about potential man-in-the-middle attacks, simply remove the
+offending key from the known_hosts file. The warning/error is expected if you
+have previously ssh'd to your local computer (i.e., ssh localhost), or you have
+used ptunnel to forward ssh connections to different hosts.
+
+Of course, for all of this to work, you need to start the proxy on your
+proxy-computer (we'll call it proxy.pingtunnel.com here). Doing this is very
+simple:
+
+sudo ./ptunnel
+
+If you find that the proxy isn't working, you will need to enable packet
+capturing on the main network device. Currently this device is assumed to be
+an ethernet-device (i.e., ethernet or wireless). Packet capturing is enabled by
+giving the -c switch, and supplying the device name to capture packets on (for
+instance eth0 or en1). The same goes for the client. On versions of Mac OS X
+prior to 10.4 (Tiger), packet capturing must always be enabled (both for proxy
+and client), as resent packets won't be received otherwise.
+
+To protect yourself from others using your proxy, you can protect access to it
+with a password using the <tt>-x</tt> switch. The password is never sent in
+the clear, but keep in mind that it may be visible from tools like top or ps,
+which can display the command line used to start an application.
+
+Finally, the -u switch will attempt to run the proxy in unprivileged mode (i.e.,
+no need for root access), and the -v switch controls the amount of output from
+ptunnel. -1 indicates no output, 0 shows errors only, 1 shows info messages, 2
+gives more output, 3 provides even more output, level 4 displays debug info and
+level 5 displays absolutely everything, including the nasty details of sends and
+receives. The -f switch allows output to be saved to a logfile.
+
+Security features: Please see the ptunnel man-page for instructions.
+
+
+Supported operating systems
+---------------------------
+Ptunnel supports most operating systems with libpcap, the usual POSIX functions
+and a BSD sockets compatible API. In particular, it has been tested on Linux
+Fedora Core 2 and Mac OS X 10.3.6 and above. As of version 0.7, ptunnel can also
+be compiled on Windows, courtesy of Mike Miller, assuming mingw and WinPcap is
+installed.
+
+
+Credits and contributors
+------------------------
+Thanks to L. Peter Deutsch for his open-source MD5 implementation, included with
+ptunnel, but also available here:
+http://sourceforge.net/projects/libmd5-rfc/
+
+Many thanks also to Mike Miller <mike@mikeage.net> for his work on creating a
+Windows port of ptunnel.
+
+Thanks to Sebastien Raveau <sebastien.raveau@epita.fr> for implementing various
+security features and SELinux support.
+
+Also thanks to Joe McKenzie, Steffen Wendzel and StalkR for contributing patches to
+ptunnel.
+
+License
+-------
+Ping Tunnel is Copyright (c) 2004-2011, Daniel Stoedle <daniels@cs.uit.no>,
+Yellow Lemon Software. All rights reserved. Ping Tunnel is licensed under the
+BSD License. Please see the LICENSE file for details.