1. 1 Iperf Adviser ： Quincy Wu Speaker ： Ying Shun Lin Nov.30 ， 2005

2. 2 Outline Introduction to iperf How to use iperf Command line option / experiment

3. 3 Introduction to Iperf ■ iperf 為網路封包（ IPv4/IPv6 ）產生軟體，進 而產生 TCP & UDP 的傳輸數據 。 ■ 量測網路的 - TCP/UDP throughput (Max.) - UDP delay jitter - UDP pack loss

4. 4 How to use iperf ■ Where to download? - http://dast.nlanr.net/Projects/Iperf/ http://dast.nlanr.net/Projects/Iperf/ ■ format - server side : $ iperf -s -% $ iperf -s -V - client side : $ iperf -c -% $ iperf -c

5. 5 Command line option class Client / Server options Server specific options Client specific options

6. 6 Command line option Server specific option -s ： run in server mode -D ： run the server as a daemon

7. 7 Command line option (Client/Server) -w ： For TCP ， window size (Default ： 8K for Windows 32.5K for FreeBSD) For UDP ， buffer size (Default ： 8K for Windows 9K for FreeBSD) -f ： specifying the format to print bandwidth numbers in. 'b' = bits/sec 'B' = Bytes/sec 'k' = Kbits/sec 'K' = KBytes/sec 'm' = Mbits/sec 'M' = MBytes/sec 'g' = Gbits/sec 'G' = GBytes/sec (Default) 'a' = adaptive bits/sec 'A' = adaptive Bytes/sec

8. 8 Command line option (cont.)

9. 9 Command line option (cont) -i ： Sets the interval time. -l ： The length of buffers to read or write. - ( Default 8KB for TCP, 1470 bytes for UDP) - Buffer Delay is unfavorable to Real-Time Application. -u ： Use UDP rather than TCP. -C ： Compatibility mode allows for use with older version of iperf.

10. 10 Command line option (cont)

11. 11

12. 12 Command line option Client specific options -b ： for UDP, bandwidth to send at in bits/sec. (default 1 Mbit/sec, implies -u) -n ： number of bytes to transmit (instead of -t) -t ： time in seconds to transmit for (default 10 secs)

13. 13

14. 14 Command line option (cont) -P ： number of parallel client threads to run.

15. 15 Command line option (cont) -B ： Bind to host,. This is only useful on multihomed hosts, which have multiple network interfaces. - For Iperf in UDP server mode, join to a multicast group. Use addresses in the range 224.0.0.0 to 239.255.255.255 for multicast

16. 16

17. 17 THANK YOU FOR YOUR ATTENTION