VTun

<h2 id="networking">Networking</h2>
<p>Like most other applications of its nature, VTun creates a single connection between two machines, over which it multiplexes all traffic.  VTun connections are initiated via a TCP connection from the client to the server. The server then initiates a UDP connection to the client, if the UDP protocol is requested.
</p><p>The software allows the creation of tunnels, for routing traffic in a manner similar to PPP, as well as a bridge-friendly ethertap connection.
</p>
<h2 id="authentication">Authentication</h2>
<p>VTun uses a Private Shared Key to negotiate a handshake via a challenge and response.
</p>
<h2 id="non-encrypting-versions">Non-encrypting versions</h2>
<p>A continual source of concern, and the target of more than one strongly worded security assessment, is that the VTun server and client binary applications can be completely built without <a href="/facts/Encryption/16q29Fdv">encryption</a> support. When such binaries are used, the encryption between both endpoints is only a simple <a href="/facts/XOR_cipher/INdSL2XL">XOR cipher</a>, which is completely trivial to decode. This type of build is not supported by the developers.
</p>

<h2 id="external-links">External links</h2>
<ul><li><a href="https://sourceforge.net/projects/vtun/">VTun</a> on <a href="/facts/SourceForge/lxYAgUAX">SourceForge</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>"vtun(8): VTun daemon - Linux man page". linux.die.net. Retrieved 2023-07-09. <a href="https://linux.die.net/man/8/vtun" target="_blank">https://linux.die.net/man/8/vtun</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>"VTun - FAQ". vtun.sourceforge.net. Retrieved 2023-07-09. <a href="https://vtun.sourceforge.net/faq.html" target="_blank">https://vtun.sourceforge.net/faq.html</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
</ol>

VTun open-in-new

VTun