ESTABLISHMENT OF VIRTUAL POLICY BASED NETWORK MANAGEMENT SCHEME BY LOAD EXPERIMENTS IN VIRTUAL ENVIRONMENT

International Journal of Computer Networks & Communications (IJCNC) Vol.8, No.3, May 2016
DOI: 10.5121/ijcnc.2016.8313 181
ESTABLISHMENT OF VIRTUAL POLICY BASED
NETWORK MANAGEMENT SCHEME BY LOAD
EXPERIMENTS IN VIRTUAL ENVIRONMENT
Kazuya Odagiri1
, Shogo Shimizu2
and Naohiro Ishii 3
1
Sugiyama Jogakuen University, Aichi, 2
Gakushuin Women’s College, Tokyo and
3
Aichi Institute of Technology, Aichi, Japan
ABSTRACT
In the current Internet-based systems, there are many problems using anonymity of the network
communication such as personal information leak and crimes using the Internet systems. This is because
the TCP/IP protocol used in Internet systems does not have the user identification information on the
communication data, and it is difficult to supervise the user performing the above acts immediately. As a
solution for solving the above problem, there is the approach of Policy-based Network Management
(PBNM). This is the scheme for managing a whole Local Area Network (LAN) through communication
control of every user. In this PBNM, two types of schemes exist. The first is the scheme for managing the
whole LAN by locating the communication control mechanisms on the course between network servers and
clients. The second is the scheme of managing the whole LAN by locating the communication control
mechanisms on clients. As the second scheme, we have been studied theoretically about the Destination
Addressing Control System (DACS) Scheme. By applying this DACS Scheme to Internet system
management, we intend to realize the policy-based Internet system management finally. In the DACS
Scheme, the inspection is not done about compatibility to cloud environment with virtualization technology
that spreads explosively. As the result, the coverage of the DACS Scheme is limited only in physical
environment now. In this study, we inspect compatibility of the DACS Scheme for the cloud environment
with virtualization technology, and enlarge coverage of this scheme. With it, the Virtual DACS Scheme
(vDACS Scheme) is established.
KEYWORDS
policy-based network management, DACS Scheme
1. INTRODUCTION
The current Internet system is a distributed autonomous system, and does not perform the unified
safety and effective operation. When the Internet system is accessed by the user that does not
understand structure of the Internet system very much, there are many problems using anonymity
of the network communication, such as personal information leak and crimes using the Internet
systems. The news of the information leak in the big company is sometimes reported through the
mass media. On the other hand, the study for the purpose of putting the whole Internet system
into the integrated management state is not performed now. Therefore, we aim at the realization
of the secure and effective operative Internet system by promoting the study of the Internet Policy
Based Network Management (Internet PBNM) under the long view. The Internet PBNM is the
concept that we have proposed than before, and is the management scheme for managing the
whole Internet system by applying the thinking of PBNM to it. In Figure 1, the image of Internet
PBNM is described.

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Specific
administrative
organization
(1)Movable and Connectable
(2)Use depending on
policy information
Application
of
policy information
Data Center
Policy Information
Managemnt Server
Ladder in a
network attack
(Prevention)×××× ××××
Personal
information
Leak
(Prevention)
Network (Org. A) Network (Org. B)
Client cmputer
of a user
Client cmputer
of a user
Client cmputer
in org. A
Figure 1 Internet PBNM
The study of the Internet PBNM has four steps as follows.
• (Step1) Study on the PBNM managing the network of the specific organization
• (Step2) Study on the PBNM managing the network group in the plural organizations
• (Step3) Study on the PBNM managing the network group in the local domain that is
within a constant range
• (Step4) Study on the PBNM finally establishing Internet PBNM
In this paper, the study of the final stages in (Step1) is described. After the completion of this
study, we are going to shift to (Step2). The existing PBNM realizes the network management of
the own organization based on network policy and security policy. It manages the whole network
of the specific organization through communication control (access control, encryption of the
communication, quality of service). The existing PBNM is standardized in plural organizations
such as Internet Engineering Task Force (IETF), Distributed Management Task Force (DMTF),
Telecoms and Internet converged Services and protocols for Advanced Network (TISPAN) of
European Telecommunications Standards Institute (ETSI), International Telecommunication
Union Telecommunication Standardization Sector (ITU-T). However, when we aim at the
realization of Internet PBNM by extending this existing PBNM, it becomes the required condition
that a specific administrative organization manages the network which other organizations hold.
The existing PBNM is the scheme that places the Policy Enforcement point (PEP) for
communication control on the course of a network. Therefore, the administrative organization
must change the other organization’s network equipment. Then, the following problems occur.
(a) Outbreak of the additional cost by the change of the network equipment
(b) Network topology change by application of the existing PBNM
(c) Limits on security policy and network policy which is caused by the network equipment
change by the administrative organization.
For the realization of Internet PBNM by application of the existing PBNM, these problems
become a big hindrance. Because the problem of (c) becomes fatal especially, it becomes
impossible to apply the existing PBNM to all organizations on Internet system. The authors
decided to take the different approach. To be concrete, they aimed at the Internet PBNM by

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realization of the PBNM scheme that does not need the network equipment change. As an initial
stage, they performed the study of (Step1). First, they established the scheme placing the software
PEP only to the physical client that is named Destination Addressing Control Scheme (DACS
Scheme). The DACS Scheme controls the specific organization’s network by communication
control on the client. Because this DACS Scheme is the method to manage the physical clients
distributed on the network, the inspection is not done about the compatibility to cloud
environment with the virtualization technology that spreads explosively. As the result, the
coverage of the DACS Scheme is limited only in physical environment now. In this study, we
inspect the compatibility of the DACS Scheme for the cloud environment with virtualization
technology, and enlarge the coverage of this scheme. With it, we assume that the Virtual DACS
Scheme (vDACS Scheme) is established. After it, we will start the study of (Step2). The rest of
this paper is organized as follows. Section 2 shows past works of the network management
including the existing PBNM. In Section 3, we describe the mechanisms and effectiveness of the
DACS scheme. In Section 4, the vDACS Scheme is established through functional experiment
and processing load experiment.
2. MOTIVATION AND RELATED WORKS
In the current Internet system, the problems using anonymity of the network communication such
as personal information leak and crimes using the Internet system occur. Because the TCP/IP
protocol used in Internet system does not have the user identification information on the
communication data, it is difficult to supervise the user performing the above acts immediately.
As the studies and technologies for Internet system management other than TCP/IP [1][2], many
technologies are studied as follow examples.
(1)Domain name system (DNS) [3]
(2)Routing protocol
(2-a) Interior gateway protocol (IGP) such as Routing information protocol (RIP) [4] and Open
shortest path first (OSPF) [5]
(2-b) Exterior gateway protocol (EGP) such as Border Gateway Protocol (BGP) [6]
(3) Fire wall (F/W) [7]
(4) Network address translation (NAT) [8] / Network address port translation (NAPT) [9]
(5) Load balancing [10][11]
(6) Virtual private network (VPN) [12][13]
(7) Public key infrastructure (PKI) [14]
(8) Server virtualization [15]
Except these studies, various studies are performed elsewhere. However, they are for managing
the specific part of the Internet system, and have no purpose of solving the above problems. As a
study for solving the above problems, the study area about PBNM exists. This is a scheme of
managing a whole LAN through communication control every user. Because this PBNM
manages a whole LAN by making anonymous communication non-anonymous, it becomes
possible to identify the user who steals personal information and commits a crime swiftly and
easily. Therefore, by applying this policy- based thinking, we have studied about the policy-based
Internet system management. In policy-based network management, there are two types scheme.
The first scheme is the scheme described in Figure 2. The standardization of this scheme is
performed in various organizations. In IETF, a framework of PBNM [16] was established.
Standards about each element constituting this framework are as follows. As a model of control
information stored in the server called Policy Repository, Policy Core Information model (PCIM)
[17] was established. After it, PCMIe [18] was established by extending the PCIM. To describe
them in the form of Lightweight Directory Access Protocol (LDAP), Policy Core LDAP Schema

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(PCLS) [19] was established. As a protocol to distribute the control information stored in Policy
Repository or decision result from the PDP to the PEP, Common Open Policy Service (COPS)
[20] was established. Based on the difference in distribution method, COPS usage for RSVP
(COPS-RSVP) [21] and COPS usage for Provisioning (COPS-PR) [22] were established. RSVP
is an abbreviation for Resource Reservation Protocol. The COPS-RSVP is the method as follows.
After the PEP having detected the communication from a user or a client application, the PDP
makes a judgmental decision for it. The decision is sent and applied to the PEP, and the PEP adds
the control to it. The COPS-PR is the method of distributing the control information or decision
result to the PEP before accepting the communication.
Figure 2 Principle in First Scheme
Next, in DMTF, a framework of PBNM called Directory-enabled Network (DEN) was
established. Like the IETF framework, control information is stored in the server storing control
information called Policy Server which is built by using the directory service such as LDAP [23],
and is distributed to network servers and networking equipment such as switch and router. As the
result, the whole LAN is managed. The model of control information used in DEN is called
Common Information Model (CIM), the schema of the CIM（CIM Schema Version 2.30.0）[24]
was opened. The CIM was extended to support the DEN, and was incorporated in the framework
of DEN. In addition, Resource and Admission Control Subsystem (RACS) [25] was established
in Telecoms and Internet converged Services and protocols for Advanced Network (TISPAN) of
European Telecommunications Standards Institute (ETSI), and Resource and Admission Control
Functions (RACF) [26] was established in International Telecommunication Union
Telecommunication Standardization Sector (ITU-T).
Figure 3 Essential Principle

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However, all the frameworks explained above are based on the principle shown in Figure 2.
Essential principle is described in Figure 3. To be concrete, in the point called PDP (Policy
Decision Point), judgment such as permission and non-permission for communication pass is
performed based on policy information. The judgment is notified and transmitted to the point
called the PEP, which is the mechanism such as VPN mechanism, router and firewall located on
the network path among hosts such as servers and clients. Based on that judgment, the control is
added for the communication that is going to pass by. The principle of the second scheme is
described in Figure 4 [27][28][29]. By locating the communication control mechanisms on the
clients, the whole LAN is managed. Because this scheme controls the network communications
on each client, the processing load is low. However, because the communication control
mechanisms need to be located on each client, the work load becomes heavy. When it is thought
that Internet system is managed by using these two schemes, it is difficult to apply the first
scheme to Internet system management practically. This is why the communication control
mechanism needs to be located on the course between network servers and clients without
exception.
Figure 4 Principle in Second Scheme
On the other hand, the second scheme locates the communication controls mechanisms on each
client. That is, the software for communication control is installed on each client. So, by devising
the installing mechanism letting users install software to the client easily, it becomes possible to
apply the second scheme to Internet system management. Furthermore, this point is dissolved
naturally when this scheme spread widely generally and the DACS Client becomes installed
normally.
The studies of the second scheme are as follows.
(1) Suggestion of the principle in the DACS Scheme [27]
(2) Additional access control function for preventing the access from the physical client that does
not have the PEP on it. [28]
(3) Processing load simulation in controlling a large number of physical clients [30]
(4) Software development for realization of the DACS Scheme [29]
(5) Operation and management system in the DACS Scheme [31]
However, the following problems are pointed out in the above study processes.
(d) Operation cost for placing the DACS Client on the physical client
(e) Guarantee of the DACS Client’s placement on the physical client
(f) The network topology change that may occur at the time of an application of existing PBNM
In this study, we solve these problems by letting the DACS Scheme to recent trend of the client
virtualization in company and university network. In other words, we establish Virtual DACS
Scheme. In Section 2 related works and technologies are performed. In Section 3, the existing

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DACS Scheme is explained. In section 4, explanation and evaluation of the vDACS Scheme are
described. In Section V, conclusion of this study and directionality of the future study are
described.
3. EXISTING DACS SCHEME
3.1 BASIC PRINCIPLE OF THE DACS SCHEME
Figure 5 Basic Principle of the DACS Scheme
Figure 5 shows the basic principle of the network services by the DACS Scheme. At the timing
of the (a) or (b) as shown in the following, the DACS rules (rules defined by the user unit) are
distributed from the DACS Server to the DACS Client.
(a) At the time of a user logging in the client.
(b) At the time of a delivery indication from the system administrator.
According to the distributed DACS rules, the DACS Client performs (1) or (2)
operation as shown in the following. Then, communication control of the client is performed for
every login user.
(1) Destination information on IP Packet, which is sent from application program, is changed.
(2) IP Packet from the client, which is sent from the application program to the outside of the
client, is blocked.
An example of the case (1) is shown in Figure 5. In Figure 5, the system administrator can
distribute a communication of the login user to the specified server among servers A, B or C.
Moreover, the case (2) is described. For example, when the system administrator wants to forbid
a user to use MUA (Mail User Agent), it will be performed by blocking IP Packet with the
specific destination information.
In order to realize the DACS Scheme, the operation is done by a DACS Protocol as shown in
Figure 6. As shown by (1) in Figure 6, the distribution of the DACS rules is performed on
communication between the DACS Server and the DACS Client, which is arranged at the
application layer. The application of the DACS rules to the DACS Control is shown by (2) in
Figure 6. The steady communication control, such as a modification of the destination
information or the communication blocking is performed at the network layer as shown by (3) in
Figure 6.

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Figure 6 Layer Setting of the DACS Scheme
The communication control on every user was given. However, it may be better to perform
communication control on every client instead of every user. For example, it is the case where
many and unspecified users use a computer room, which is controlled. In this section, the method
of communication control on every client is described, and the coexistence method with the
communication control on every user is considered. When a user logs in to a client, the IP address
of the client is transmitted to the DACS Server from the DACS Client. Then, if the DACS rules
corresponding to IP address, is registered into the DACS Server side, it is transmitted to the
DACS Client. Then, communication control for every client can be realized by applying to the
DACS Control. In this case, it is a premise that a client uses a fixed IP address. However, when
using DHCP service, it is possible to carry out the same control to all the clients linked to the
whole network or it’s subnetwork for example.
Figure 7 Creating the DACS rules on the DACS Server
When using communication control on every user and every client, communication control may
conflict. In that case, a priority needs to be given. The judgment is performed in the DACS Server
side as shown in Figure 7. Although not necessarily stipulated, the network policy or security
policy exists in the organization such as a university (1). The priority is decided according to the
policy (2). In (a), priority is given for the user's rule to control communication by the user unit. In
(b), priority is given for the client's rule to control communication by the client unit. In (c), the
user's rule is the same as the client's rule. As the result of comparing the conflict rules, one rule is
determined respectively. Those rules and other rules not overlapping are gathered, and the DACS
rules are created (3). The DACS rules are transmitted to the DACS Client. In the DACS Client
side, the DACS rules are applied to the DACS Control. The difference between the user's rule and
the client's rule is not distinguished.

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3.2 SECURITY MECHANISM OF THE DACS SCHEME
In this section, the security function of the DACS Scheme is described. The communication is
tunneled and encrypted by use of SSH. By using the function of port forwarding of SSH, it is
realized to tunnel and encrypt the communication between the network server and the, which
DACS Client is installed in. Normally, to communicate from a client application to a network
server by using the function of port forwarding of SSH, local host (127.0.0.1) needs to be
indicated on that client application as a communicating server. The transparent use of a client,
which is a characteristic of the DACS Scheme, is failed. The transparent use of a client means
that a client can be used continuously without changing setups when the network system is
updated. The function that doesn't fail the transparent use of a client is needed. The mechanism of
that function is shown in Figure 8.The changed point on network server side is shown as follows
in comparison with the existing DACS Scheme.
Figure 8 Extend Security Function
SSH Server is located and activated, and communication except SSH is blocked. In Figure 8 the
DACS rules are sent from the DACS Server to the DACS Client (a). By the DACS Client that
accepts the DACS rules, the DACS rules are applied to the DACS Control in the DACS Client (b).
The movement to here is same as the existing DACS Scheme. After functional extension, as
shown in (c) of Figure 8 the DACS rules are applied to the DACS SControl. Communication
control is performed in the DACS SControl with the function of SSH. By adding the extended
function, selecting the tunneled and encrypted or not tunneled and encrypted communication is
done for each network service. When communication is not tunneled and encrypted,
communication control is performed by the DACS Control as shown in (d) of Figure 8. When
communication is tunneled and encrypted, destination of the communication is changed by the
DACS Control to localhost as shown in (e) of Figure 8. After that, by the DACS STCL, the
communicating server is changed to the network server and tunneled and encrypted
communication is sent as shown in (g) of Figure 8, which are realized by the function of port
forwarding of SSH. In the DACS rules applied to the DACS Control, localhost is indicated as the
destination of communication. In the DACS rules applied to the DACS SControl, the network
server is indicated as the destination of communication. As the functional extension explained in
the above, the function of tunneling and encrypting communication is realized in the state of
being suitable for the DACS Scheme, that is, with the transparent use of a client. Then, by
changing the content of the DACS rules applied to the DACS Control and the DACS SControl, it
is realized to distinguish the control in the case of tunneling and encrypting or not tunneling and
encrypting by a user unit. By tunneling and encrypting the communication for one network
service from all users, and blocking the untunneled and decrypted communication for that
network service, the function of preventing the communication for one network service from the
client, which DACS Client is not installed in is realized. Moreover, even if the communication to
the network server from the client, which DACS Client is not installed in is permitted, each user
can select whether the communication is tunneled and encrypted or not. The function of
preventing information interception is realized.

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3.3 SPECIFICATION OF THE DACS SYSTEM
(a) Communications between the DACS Server and the DACS Client
The Communications between the DACS Server and the DACS Client were realized by the
communications through a socket in TCP/IP.
(b) Communication control on the client computer
In this study, the DACS Client working on windows XP was implemented. The functions of the
destination NAT and packet filtering required as a part of the DACS Control were implemented
by using Winsock2 SPI of Microsoft. As it is described in Figure 9 Winsock2 SPI is a new layer
which is created between the existing Winsock API and the layer under it. To be concrete, though
connect() is performed when the client application accesses the server, the processes of
destination NAT for the communication from the client application are built in WSP connect()
which is called in connect(). In addition, though accept() is performed on the client when the
communication to the client is accepted, the function of packet filtering is implemented in
WSPaccept() which is called in accept().
Figure 9 Winsock2 SPI
(c) VPN communication
The client software for the VPN communication, that is, the DACS SControl was realized by
using the port forward function of the Putty. When the communication from the client is
supported by the VPN communication, first, the destination of this communication is changed to
the localhost. After that, the putty accepts the communication, and sends the VPN communication
by using the port forward function.
3.4 POINTS OF SOFTWARE SPECIFICATIONS
The characteristic of the DACS System’s implementation is the coping processes at the time of
conflicting the relation between communication control every user and communication control
every client. At this point, by using algorithm shown in Figure 10, the DACS System is
implemented. First, as Action 1, the judgment table for client control is searched. If the IP address
of the client exists in this table, Action 2 is performed. If not, Action 3 is performed. When
Action 2 is performed, the control rules every client are searched and extracted from the IP
address rule table which has control rules every client (every IP address). When Action 3 is
performed, the judgment table for user control is searched. If the user logging in the client exists
in this table, Action 4 is performed. If not, status 1 showing “no applicable rule” is returned.
When Action 4 is performed, the Figure 4 Principle in Second Scheme

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Figure 10 Used Algorism
4. ESTABLISHMENT OF THE VDACS SCHEME
To confirm the possibility of the wDACS Scheme, we performed functional experiments. By the
experiments, we confirmed that the software for the existing DACS Scheme could be operated in
cloud environment.
4.1 Experiment System
In Figure 11, the experiment system used in this study was described. Two virtual servers which
placed VMWare ESXi 5.1 were prepared. Each virtual server was constructed as follows.
(1) Virtual Server 1 (CPU：2.8GHz 4Core×1 Memory:16GB)
Virtualization software：VMWareESXi5.1
Virtual machine A：
Operating System (CentOS6.5)
Software for DACS Server
Virtual machine B：
Authentication server (OpenLDAP2.4)
Virtual machine C：
Windows domain server (Samba3.6)
Virtual router for a gateway (Vyatta6.6：64bit)
(2) Virtual Server 2 (CPU：2.6GHz 4Core×1 Memory:16GB)
Virtualization software：VMWareESXi5.1
Each virtual machine (5 virtual machine)：
Operating System (Windows XP Pro)
Software for DACS Client
Virtual router for a gateway (Vyatta6.6：64bit)

191
Because we assumed that the service based on this scheme would be offered in the cloud
environment, we prepared the experimental environment which each virtual router on each virtual
server was connected by IPsec VPN each other.
The DACS Server was located on the virtual machine A (VM A) in the virtual server 1. The
DACS Client was located on each virtual client in the virtual server 2, and the DACS Client was
located on the CentOS in each virtual client. The policy information was sent and received
through the VPN connected by two virtual routers on each virtual server.
VM（Virtual Machine)
Virtual Server１１１１
認証サーバ認証サーバ認証サーバ認証サーバDACS
Server
(vm1)
Windows
ドメインサーバドメインサーバドメインサーバドメインサーバ
Virtual Server1
DACS
Client
DACS
Client
Virtual
Client
Virtual
Router
(Vyatta)
Virtual
Router
(Vyatta)
DACS
Client
IPsec VPN
VM A VM B VM C
Figure 11 Experiment system
4.2 CONTENT OF THE FUNCTIONAL EXPERIMENT
By using the experiment system in Figure 11, we performed the experiments about two functions
as follows.
(a) User authentication function
In this experimental system, the Windows OS (XP Pro) is used as an operating system on each
virtual machine in the virtual server 2. In addition, because we intend to release the software
developed to realize this scheme, we adopt the user authentication mechanism by free software.
To be concrete, user authentication processes are performed between the clients on the virtual
server 2 and the DACS Server on the virtual server1. About this point, we could confirm the
movement normally.
• (Server1) OpenLDAP server for managing user accounts
• (Server2) Samba server for building a windows domain
(b) Delivery function of policy information
After the process (a), the policy information is sent and received through the VPN connected by
two virtual routers on each virtual server. About this process, two cases of movement experiments
are performed as follows.
• (Case1) One virtual machine was operated on the virtual server 2.
• (Case2) Some virtual machines (Five virtual machines) were operated on the virtual
server 2.

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4.3 RESULT OF FUNCTIONAL EXPERIMENT
The communication log was shown in Figure 12.
Figure.12 Communication log
As the result, we could confirm that the DACS Scheme to manage a physical client
conventionally was operated in cloud environment.
4.4 RESULT OF PROCESSING LOAD EXPERIMENT
Next, by using the experiment system, we measured the processing load to occur on the DACS
Server side that is performed by concurrent delivery process of policy information between the
DACS Server and the DACS Clients. To be concrete, by using 100 virtual clients, we measured
the maximum value of the CPU processing speed on the virtual machine A on the virtual server 1.
Because we could not place all virtual clients on virtual server 2 by the limitation of server
resources, some virtual machines were located on virtual server 1.
The measure was carried out by using the standard tool of VMWare ESXi. Because we confirmed
the consumption of the memory at that time, there was no problem at this point in particular.
The number of measurement is ten times. The maximum value of the CPU processing speed of
each time is described in the Figure 13. The average value of ten times was 55.9MHz.
Figure 13 Maximum value of the CPU processing speed
As reference materials, we listed the graph on the result of the measurement from the first to fifth
in Figure 14.
Figure 14 Graph of Maximum value (1th-5th

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Then, the graph on the result of the measurement from the sixth to tenth was also listed in Figure
15.
Figure 15 Graph of Maximum value (6th-10th)
Though we explain it for sense, Figure 15 and 16 mentioned above is the figure which was made
based on the hard copy of VMWare ESXi tool. The processing load to occur on the DACS Server
side was the low value than prior expectation This value is approximately a one-50th of the CPU
performance (2.8GHz) of virtual server 1 which placed DACS Server. Though network
environment of the experiment system was different from the real network environment, the
DACS Sever may tolerate the concurrent processing from the virtual clients of around
5,000(50*100) theoretically. About this point, we intend to do additional experiment after having
prepared for additional experiment facilities. If possible, we want to carry out the processing load
experiment with number as close as possible to 5,000 mentioned above. Because we could
confirm association between the CPU processing performance of the server machine with the
DACS Server and the number of client machine with the DACS Client to some extent, we
thought that the vDACS Scheme was established.
5. CONCLUSIONS
In this study, we established the vDACS Scheme. Because the existing DACS Scheme was the
scheme to manage physical clients, we inspected compatibility of the DACS Scheme for the
virtual environment and enlarged coverage of the scheme. To be concrete, after we confirmed that
the software for the existing DACS Scheme could be operated with no problem functionally,
processing load experiment was performed by using experiment system. As the result, we
confirmed that the software moved on the virtual environment normally and the DACS Sever
accepted accesses of 100 virtual clients in the range of CPU processing speed of the 55.9MH
degree. As future works, we will perform additional processing load experiment by using more
clients if possible with the client of around 5,000.
ACKNOWLEDGEMENTS
This work was supported by JSPS KAKENHI Grant Number 26730037. We express the will of
thanks here.
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