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I am trying to measure the network bandwidth between two cloud virtual machines, using iperf. Machine A runs 

    iperf -s

and machine B 

    iperf -c <ip of machine A>.

This doesn't work, while executing 

    iperf -c localhost

in machine A works fine. The firewall is not the problem as I have opened the port needed(5001 , using sudo ufw allow 5001).

Also, I would like to note that the whole process works flawlessly on machines running on another cloud provider.

rawrintheclouds
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1 Answers1

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Just solved the problem. Turns out the security group of the VMs should also have port 5001 open (so somehow I should know that I would need this port opened at the time of the VM creation?). Also, even though I added the corresponding firewall rule, it didn't work until I changed security groups.

rawrintheclouds
  • 89
  • 8