Scholarly article on topic 'A Research on IPv6/IPv4-Based Network Performance Test'

A Research on IPv6/IPv4-Based Network Performance Test Academic research paper on "Mechanical engineering"

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{IPv6 / "IPv6/IPv4 tunnel" / "performance me asurement ;"}

Abstract of research paper on Mechanical engineering, author of scientific article — Ting Ting Zhang, Jian Chen, Hong Yan Wei, Jin Yao Jiang

Abstract With a thorough investigation of analysis parameters and methods on network performance, feasible ways to measure and to analyze IPv6 network performance are explored and put forward. Experiments in this research, in which Fluk is deployed as protocol analyzer and D-ITG as grouped transmitting source, are conducted in measuring roughness of IPv6 network performance. Results of these experiments are recorded. In addition, a network performance test instrument called NPT4/6 is designed and then used in testing IPv6 dual-stack and IPv6/Ipv4 tunnel. Major performance indexes in network-internal links, such as RTT, loss rate, and route capacity etc, are analyzed. Measurement results provide evidence to the current suspect of IPv6 tunnel performance.

Academic research paper on topic "A Research on IPv6/IPv4-Based Network Performance Test"

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Procedía Engineeri ng 29 (2012) 1573 - 1577

Procedía Engineering

www.elsevier.com/Iocate/procedia

2012 International Workshop on Information and Electronics Engineering (IWIEE)

A Research on IPv6/IPv4-Based Network Performance Test

TingTing Zhang a*, JianChenb, HongYanWeia, JinYaoJianga'

aInstitute of Science, PLA Univ. of Sci. & Tech, Nanjing 211101, China bInstitute of Command Automation, PLA University of Science &Technology, Nanjing, 210007, China

Abstract

With a thorough investigation of analysis parameters and methods on network performance, feasible ways to measure and to analyze IPv6 network performance are explored and put forward. Experiments in this research, in which Fluk is deployed as protocol analyzer and D-ITG as grouped transmitting source, are conducted in measuring roughness of IPv6 network performance. Results of these experiments are recorded. In addition, a network performance test instrument called NPT4/6 is designed and then used in testing IPv6 dual-stack and IPv6/Ipv4 tunnel. Major performance indexes in network-internal links, such as RTT, loss rate, and route capacity etc, are analyzed. Measurement results provide evidence to the current suspect of IPv6 tunnel performance.

© 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Harbin University of Science and Technology

Keyword: IPv6, IPv6/IPv4 tunnel, performance me asurement;

1. Main text

To the users of network, IPv6 or IPv4 is only network protocol. What they can feel is only that the performance based on network application has changed.Net performance is very important to the professional network with the core of timeliness. That's why we need to do some research to compare the net performance of IPv6 and IPv4, especially the tunnel performance [1] of IPv6/IPv4. In order to measure these performance parameters quantitatively, we need to study and solve the performance parameters, measurement methods, measurement tools, the analysis of measurement data, and etc of the measured network.

* Corresponding author. Tel.:0-13062563872.

E-mail address: zhaagtiags@sohu.com.

1877-7058 © 2011 Published by Elsevier Ltd. doi:10.1016/j.proeng.2012.01.175

Research ideas:

• Select the performance indicators of measured network.

• Select and design the measurement method and tools.

• Design and practice the measurement tool if the existed measurement tools cannot meet the requirement.

• Analyze the measured data and get the conclusion of measured net performance.

2. Research on the measurement method of net performance

By analysis, the performance indicators of selected and measured net are the most important performance indicators to measure the network, which includes the round-trip delay between two nodes, packet loss and bandwidth parameters.

2.1. M/asur/m/nt of path capacity - m/asur/m/nts mad/ tog/th/r

For the determination of path capacity, two indicators are used to identify. Indicators 1: when the test flow strength (capacity) going through one path is confirmed, the packet loss rate of the path will be tested. Indicator 2: when the packet loss rate is determined, the maximum traffic intensity (capacity) of the path will be tested.

When the capacity of the path is measured, the path is assuming to be fixed, that means the components and elements of the path will not change because of the reason of selection of route and others.

The key problem to realize the measurement of path capacity is that the test accuracy must be ensured when the high-intensity test packet stream is sent. Based on it, the coordinated measurement method is proposed on the test. Figure 1 shows the measurement model.

Where, h0 is the main control system of the test, hn is the response system of the test, the test flow range is {1 ~ 10 Mbps} to keep light load. S1, ..., Si (i = 1, 2, ...) are test traffic generators used to produce a high-intensity additional flow of some path and the test flow range is{1 ~ 75 Mbps}; the destination of the flow is flow applied point hn-1, whose router is usually chosen in the front of hn, near the port of the side of the response system.

The router at the bottleneck of the path is assuming to packet lose with equal probability (x + y), the packet loss p (X) will change as the test packet stream X changes, and the total packet loss of the path is (x + y) p (X). So now it is easy to calculate the tested value p (X) according to the sending number x of main control system and receiving amount x [1-p (X)] of responding system.

Figure 1 working model of the path capacity measurement system

2.2. RTT m/asur/m/nt

On the calculation and link composition of RTT, Jacobson, and Downey described in detail in literature [2] and literature [3], and gave the network model of RTT. Starting from node n -1 to node n, the returning link RTT can be expressed as:

In which qi is a random variable of queuing delay, lat+packet_size/bw and lat+icmp_size/bw are respectively the transmission time (propagation delay) of data packet on the forward link and the triggered ICMP error message (such as ICMP Port Unreachable), or the propagation delay of ICMP Echo Reply packet on the returning link. Forward is the processing time for data packet of the router's forwarding engine (forward engine). Referring to Jacobson's assumption, the sending delay icmp_size/bw of forward and ICMP are considered to be ignored.

RTTXyz(t)=qxi (t)+(lat+icmp_size/bw) +qy2(t)+qy3(t)+lat+qX4(t) (2)

That means the RTT measured by LD algorithm includes the loop link propagation delay, the sending delay of probe packets on the forward path and the queuing delay of probe packets on point X and Y.

ICMP Echo Request packets are used in the measurement. According to Jacobson's assumptions, (2) can be further simplified as:

The measurement of RTT is shown. Firstly the measurement is made by the custom and let it join in the join queue when it is permitted. The control module will check the job queue regularly and adjust and execute the task meeting the implementation conditions and resources permission. On execution, the traffic patterns will be matched and sent according to the specified time interval and the packet length.

3. Design and Implementation of Network Performance Tester NPT4 / 6

The active measurement method is selected to measure network performance. It requires producing the controlled testing packet source on time and intensity; solving the problems of clock synchronization between the sources of sending packet test and receiving packet test; solve the problem of time difference between sending packet test and receiving packet test; solving the problem of sending packet counting and receiving packet counting.

Two basic testing method are designed: Method One: use D-ITG [4] as the source of the sending packet and use FLUK protocol analyzer to record the receiving packets result. Method Two: Design and implement network performance tester NPT4 / 6.

Use "method one" to test the pure IPv6 network, IPv4/IPv6 dual-stack and IPv6/IPv4 tunnel performance and analyze the impact to the tested network from different data packet. The measurement found that the delay increases as the data packets increases and the packet loss rate is vice versa for pure IPv6 network and IPv4/IPv6 dual-stack network. The packet loss and delay vary widely in the case of establishing IPv6/IPv4tunnel. However, the result getting by this testing method is an estimate, whose precision and accuracy is not enough, especially the precision of time synchronization is not enough. The network performance tester NPT4/6 is designed to achieve more accurate measurement.

RTT=q1+(lat+icmp_size/bw)+q2+forward+q3+(lat+icmp_size/bw)+q4

RTTxyz(t) =qxi(t) +lat+qy2(t)+qy3(t) +lat+qX4(t)

3.1. System structure of NPT4/6

The major functions of each part are as follows:

• master subsystem: Responsible for the operation control of the testing tool to let all parts of the system collaborate with each other together to complete the test task. Its main features include: configuration parameters, sending ping packets, resulting light-load test traffic (1 ~ 10 Mbps), coordinating

and controlling the flow generator subsystem and the coordination to response subsystem.

• traffic generator subsystem: Generate high-intensity test flow (< 74 Mbps) under the control of the master subsystem and allow multiple traffic generators work simultaneously.

• response subsystem: Receive and statistic the testing packets sending by the master subsystem according to the command of master subsystem. Send the result back to the master subsystem when a measurement process is complete.

4. network performance measurement and analysis

4.1. m/asur/m/nt /nvironm/nt and /xp/rim/ntal d/sign

Use the above measurement system to test the performance of pure IPv6 network, dual-stack network and IPv6/IPv4 tunnel.

According to the test model shown in Figure 1, the measurement environment is constructed as Figure 2. It can be seen from the figure that the source node h connects with the destination node d through routers R1 and R2. The bandwidth of each link is 100Mbps.

Figure 2 Environment test

4.2. P/rformanc/ m/asur/m/nt and analysis

The comparison of round-trip delay RTT value from the end to end of pure IPv6 network, IPv4/IPv6 dual-stack and IPv6/IPv4 tunnel is shown in Figure3.

Figure 3 Contrast different network RTT

Figure 4 (a) packet loss rate at different flow intensity for pureIPv6 and dual stack environment; (b) packet loss rate at different flow intensity for tunnel mode

Figure 4 (a) and (b) show the packet loss rate changes at different flow intensity. The value of packet loss rate is the average value measured by10 times under every same traffic intensity. The packet loss rate will increase with traffic intensity increases for pureIPv6 and dual stack environment, but still in a very bottom of the range. But at the same flow rate, the packet loss rate in tunnel mode is significantly higher than the pure IPv6 network and dual stack network. When traffic increased to 30Mbps, the interrupt produces and the packet loss rate is 100%.

5. Conclusion

It can be seen from the above measurement and analysis that in the dual-stack environment, the overall network performance changes slightly with the gradual increase of IPv6 traffic when IPv4 network was introduced into the application of IPv6. IPv6 will not have an impact on existing IPv4 applications. As a transition way, dual stack is easy to implement. It also has high support rate from the current network equipment and won't affect the function of the network, dual stack is one of the best transition way. The current tunneling technology has a different impact to the key performance indicators of IPv6 network when it is widely used in IPv6 network. So it is certified the idea of "the use of the tunnel can affect the performance of IPv6 network"

6. References

[1] Wang Y, Ye SZ, Li X. Understanding current IPv6 performance. To appear in Proceedingsof the Tenth IEEE Symposium on Computers and Communications (ISCC 2005) ; 2005-6.

[2] Colitti L, Battista G D, Patrignani M. IPv6-in-IPv4 tunnel discovery: methods and experimental results. IETF Transaction on Network and Service Managemet; 2004, 1(1).

[3] Almes G, Kalidindi S, Zekauskas M. A Round-trip delay metric for IPPM. RFC 2681 ; September 1999.

[4] Avallone S. Pescape A, Ventre G.. Distributed internet traffic generator (D-ITG): analysis and experimentation over heterogeneous networks . Proc.of the 11th IEEE Int l Conf.on Network Protocols (ICNP 2003). Atlanta, Georgia, USA; November 2003. http://www.grid.unina.it/sofftware/ ITG/.