I did iperf test from one Linux server to another. One server is in Helsinki, other is in London and they are connected with a VPN tunnel(should be 100Mbps/100Mbps connection). I started iperf server in London(192.168.1.2) and iperf client in Helsinki(192.168.1.1). I started server with this "iperf -s -u -fm" command and client with "iperf -c 192.168.1.2 -fm -d -t600 -u -b 100m" command. Output was fallowing:
#iperf -c 192.168.1.2 -fm -d -t600 -u -b 100m Server listening on UDP port 5001 Receiving 1470 byte datagrams UDP buffer size: 0.10 MByte (default) ------------------------------------------------------------ ------------------------------------------------------------ Client connecting to 192.168.1.2, UDP port 5001 Sending 1470 byte datagrams UDP buffer size: 0.10 MByte (default) ------------------------------------------------------------ [ 4] local 192.168.1.1 port 44456 connected with 192.168.1.2 port 5001 [ 3] local 192.168.1.1 port 5001 connected with 192.168.1.2 port 31435 [ ID] Interval Transfer Bandwidth [ 4] 0.0-600.0 sec 7189 MBytes 101 Mbits/sec [ 4] Sent 5128207 datagrams [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 3] 0.0-600.2 sec 2396 MBytes 33.5 Mbits/sec 0.244 ms 3419123/5128199 (67%) [ 4] Server Report: [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 4] 0.0-600.1 sec 2411 MBytes 33.7 Mbits/sec 0.199 ms 3408321/5128207 (66%) [ 4] 0.0-600.1 sec 299 datagrams received out-of-order How can there be bandwidth from Helsinki to London 101 Mbits/sec when Iperf server from London raports 33.7 Mbits/sec? How can there be such a huge packet loss(67% from London to Helsinki and 66% from Helsinki to London)? I would appriciate any comments about inner workings of Iperf or explanations about Iperf output :) Thank you in advance!! ------------------------------------------------------------------------------ SOLARIS 10 is the OS for Data Centers - provides features such as DTrace, Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW http://p.sf.net/sfu/solaris-dev2dev _______________________________________________ Iperf-users mailing list Iperf-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/iperf-users
