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+/*
+ *  OpenVPN -- An application to securely tunnel IP networks
+ *             over a single TCP/UDP port, with support for SSL/TLS-based
+ *             session authentication and key exchange,
+ *             packet encryption, packet authentication, and
+ *             packet compression.
+ *
+ *  Copyright (C) 2010-2018 Fox Crypto B.V. <openvpn@fox-it.com>
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/**
+ * @file
+ * External Multiplexer module documentation file.
+ */
+
+/**
+ * @addtogroup external_multiplexer External Multiplexer module
+ *
+ * The External Multiplexer is the link between the external network
+ * interface and the other OpenVPN modules.  It reads packets from the
+ * external network interface, determines which remote OpenVPN peer and
+ * VPN tunnel they are associated with, and whether they are data channel
+ * or control channel packets.  It then passes the packets on to the
+ * appropriate processing module.
+ *
+ * This module also handles packets traveling in the reverse direction,
+ * which have been generated by the local control channel or which have
+ * already been processed by the \link data_control Data Channel Control
+ * module\endlink and are destined for a remote host reachable through a
+ * VPN tunnel.
+ */