Hello iperf users, I am trying to measure Jitter and Packet Loss in both directions between two distant endpoints in a WAN network (multiple hops apart), using iperf 2.0.5 on debian linux machines. These are the commands I use and the results am getting:
Client: *iperf -u -c XXX.XXX.XXX.XXX -p 54003 -d -b 10K -l125 -n1250* Server: *iperf -u -s -p 54003* Client Result: ------------------------------------------------------------ Server listening on UDP port 54003 Receiving 125 byte datagrams UDP buffer size: 208 KByte (default) ------------------------------------------------------------ ------------------------------------------------------------ Client connecting to XXX.XXX.XXX.XXX, UDP port 54003 Sending 125 byte datagrams UDP buffer size: 208 KByte (default) ------------------------------------------------------------ [ 4] local YYY.YYY.YYY.YYY port 38604 connected with XXX.XXX.XXX.XXX port 54003 [ 3] local YYY.YYY.YYY.YYY port 54003 connected with XXX.XXX.XXX.XXX port 49914 [ ID] Interval Transfer Bandwidth [ 4] 0.0- 1.0 sec 1.22 KBytes 9.99 Kbits/sec [ 4] Sent 10 datagrams [ 4] WARNING: did not receive ack of last datagram after 10 tries. [ 3] 0.0-12.6 sec 15.4 KBytes 10.0 Kbits/sec 0.158 ms 0/ 126 (0%) Server Result: ------------------------------------------------------------ Server listening on UDP port 54003 Receiving 1470 byte datagrams UDP buffer size: 208 KByte (default) ------------------------------------------------------------ ------------------------------------------------------------ Client connecting to YYY.YYY.YYY.YYY, UDP port 54003 Sending 125 byte datagrams UDP buffer size: 208 KByte (default) ------------------------------------------------------------ [ 5] local XXX.XXX.XXX.XXX port 49914 connected with YYY.YYY.YYY.YYY port 54003 [ 3] local XXX.XXX.XXX.XXX port 54003 connected with YYY.YYY.YYY.YYY port 38604 [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 3] 0.0- 1.0 sec 1.22 KBytes 10.0 Kbits/sec 0.139 ms 0/ 10 (0%) [ 5] 0.0-12.6 sec 15.4 KBytes 10.0 Kbits/sec [ 5] Sent 126 datagrams [ 5] Server Report: [ 5] 0.0-12.6 sec 15.4 KBytes 10.0 Kbits/sec 0.157 ms 0/ 126 (0%) Now, I have some questions: *A) Why am I getting a WARNING at the client side instead of a report?* *B) Why is it 1 second for one direction and 12 seconds for the other?* *B) **In my case, **do I have to use the same flags for both client and server iperf commands for the reverse Packet Loss and Jitter test to succeed?* *C) In rare cases where I do get a reverse direction report like below, which one indicates traffic from client to server and which one is the opposite?* [ 4] local YYY.YYY.YYY.YYY port 42671 connected with XXX.XXX.XXX.XXX port 54003 [ 3] local YYY.YYY.YYY.YYY port 54003 connected with XXX.XXX.XXX.XXX port 48355 [ ID] Interval Transfer Bandwidth [ 4] 0.0-10.1 sec 12.3 KBytes 10.0 Kbits/sec [ 4] Sent 101 datagrams [ 3] 0.0-10.1 sec 12.3 KBytes 10.0 Kbits/sec 0.083 ms 0/ 101 (0%) [ 4] Server Report: [ 4] 0.0-10.1 sec 12.3 KBytes 10.0 Kbits/sec 0.420 ms 0/ 101 (0%) *Thanks,* *Ayrton*
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