perfSONAR User Q&A and Other Discussion

[Mark Feit <>]

Tadeja Saje writes:

    pscheduler task throughput --duration PT20S --dest mp-tpl-pf1.arnes.si 
    --ip-version 4 --source mp-ijs-pf1.arnes.si
    ...        
    debbuging from mp-ijs-pf1.arnes.si:
    /usr/bin/iperf3 -s -1 --json -p 5201 -B mp-tpl-pf1.arnes.si -4
    {
        ...
        "error":        "error - unable to start listener for connections: 
Cannot 
    assign requested address",
    }

That message means that iperf3 is trying to bind its listener to an address 
that is not present on any interface on the system.  It will attempt to 
resolve the host name to an IP and use whatever it gets.  I can see what 
appears to be the right address in DNS, but it may resolve differently on 
that system.

    if I try:
    telnet telnet mp-tpl-pf1.arnes.si 5201
    the port is open.

I did the same thing from here and got the same result.  That port should 
only be open when the machine is participating in a throughput test, and 
yours wasn't at the time.  Is there a stray copy of the iperf3 server running?

--Mark