System.Net.Sockets.Socket.SetReceivingPacketInformation C# (CSharp) Method

        internal void SetReceivingPacketInformation()
        {
            if (!_receivingPacketInformation)
            {
                // DualMode: When bound to IPv6Any you must enable both socket options.
                // When bound to an IPv4 mapped IPv6 address you must enable the IPv4 socket option.
                IPEndPoint ipEndPoint = _rightEndPoint as IPEndPoint;
                IPAddress boundAddress = (ipEndPoint != null ? ipEndPoint.Address : null);
                Debug.Assert(boundAddress != null, "Not Bound");
                if (_addressFamily == AddressFamily.InterNetwork)
                {
                    SetSocketOption(SocketOptionLevel.IP, SocketOptionName.PacketInformation, true);
                }

                if ((boundAddress != null && IsDualMode && (boundAddress.IsIPv4MappedToIPv6 || boundAddress.Equals(IPAddress.IPv6Any))))
                {
                    SocketPal.SetReceivingDualModeIPv4PacketInformation(this);
                }

                if (_addressFamily == AddressFamily.InterNetworkV6
                    && (boundAddress == null || !boundAddress.IsIPv4MappedToIPv6))
                {
                    SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.PacketInformation, true);
                }

                _receivingPacketInformation = true;
            }
        }