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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
+ * Reliability Layer module documentation file.
+ */
+
+/**
+ * @defgroup reliable Reliability Layer module
+ *
+ * The Reliability Layer is part of OpenVPN's control channel.  It
+ * provides a reliable and sequential transport mechanism for control
+ * channel messages between OpenVPN peers.  This module forms the
+ * interface between the \link external_multiplexer External
+ * Multiplexer\endlink and the \link control_tls Control Channel TLS
+ * module\endlink.
+ *
+ * @par UDP or TCP as VPN tunnel transport
+ *
+ * This is especially important when OpenVPN is configured to communicate
+ * over UDP, because UDP does not offer a reliable and sequential
+ * transport.  OpenVPN endpoints can also communicate over TCP which does
+ * provide a reliable and sequential transport.  In both cases, using UDP
+ * or TCP as an external transport, the internal Reliability Layer is
+ * active.
+ */