index: behavior, install, doc

The home page was too minimalistic, only describing mptcpd in general.

Adding info about the default behaviour, how to install it, and where to
find the documentation should hopefully better guide new users.

Signed-off-by: Matthieu Baerts (NGI0) <[email protected]>

index.html

@@ -19,4 +19,42 @@ <h1>Multipath TCP Daemon</h1>
     addresses), available network interfaces, request new MPTCP
     subflows, handle requests for subflows, etc.
   </p>
+  <h2>Behavior</h2>
+  <p>
+    By default, this daemon will load the <code>addr_adv</code> plugin, which
+    will add MPTCP endpoints with the <code>subflow</code> flag ("client" mode)
+    for the default in-kernel path-manager. Note that this is something
+    <a href="https://networkmanager.dev/blog/networkmanager-1-40/#mptcp-support">
+    NetworkManager 1.40 or newer</a> does by default. Having several daemons
+    configuring the MPTCP endpoints at the same time should be avoided. This
+    daemon is usually recommended when NetworkManager 1.40 or newer is not
+    available, or when advanced per-connection path management is needed, using
+    the userspace path-manager and a custom made
+    <a href="https://github.com/multipath-tcp/mptcpd/wiki/Plugins">plugin</a>
+    using the <a href="doc/html">C API</a>.
+  </p>
+  <p>
+    To change this behavior, with NetworkManager, look for the
+    <code>connection.mptcp-flags</code> option in the
+    <a href="https://networkmanager.dev/docs/api/latest/nm-settings-nmcli.html#nm-settings-nmcli.property.connection.mptcp-flags">
+    settings</a>, while for <code>mptcpd</code>, look at the
+    <code>/etc/mptcpd/mptcpd.conf</code> config file, or disable the service if
+    it is not needed. Make sure not to have both NetworkManager and
+    <code>mptcpd</code> conflicting to configure the MPTCP endpoints.
+  </p>
+  <h2>Installation</h2>
+  <p>
+    <code>mptcpd</code> is packaged in most major distributions. If it is not
+    available on your side, or if a more recent version is required, the build
+    process is explaining on the <a href="README.html">Getting Started</a>
+    section.
+  </p>
+  <h2>Documentation</h2>
+  <p>
+    Please reference the <a href="doc/html">C API</a> for <code>mptcpd</code>
+    documentation, the
+    <a href="https://github.com/multipath-tcp/mptcpd/wiki/Plugins">Plugins</a>
+    wiki page for a higher level documentation, and <a href="https://mptcp.dev">
+    mptcp.dev</a> for the overall Multipath TCP for Linux project.
+  </p>
 </div>