iperf | iperf3 : A TCP , UDP , and SCTP network bandwidth

Example from the iperf3.txt file created.

[SUM] 0.00-30.00 sec 1.09 GBytes 312 Mbits/sec sender
[SUM] 0.00-30.00 sec 1.09 GBytes 312 Mbits/sec receiver

I would like to be able to "extract" the 312 Mbits/sec-text and leave the rest alone. Previous I've used this line of code to "present" the numbers from the iPerf-speedtest after the PS-script was completed, but the entire line is displayed like the example, I put in above.

Get-Content -Path $iperf3.txt | Where-Object {$_ -like'*[SUM]*0.00-15.00*'}

I've been looking at this post Get filtered content from text file with Get-Content and wondered if that is what is needed to do what I want.

I would like to end result to be something like this:

Your speedtest result is 123 Mbits/sec for download.
Your speedtest result is 321 Mbits/sec for upload.

Any input or feedback would be appreciated. Thanks!

EDITED/UPDATED
More text from the text-file.

[ ID] Interval Transfer Bandwidth Retr
[ 5] 0.00-30.00 sec 116 MBytes 32.5 Mbits/sec 91 sender
[ 5] 0.00-30.00 sec 116 MBytes 32.3 Mbits/sec receiver
[ 7] 0.00-30.00 sec 116 MBytes 32.6 Mbits/sec 94 sender
[ 7] 0.00-30.00 sec 116 MBytes 32.4 Mbits/sec receiver
[ 9] 0.00-30.00 sec 109 MBytes 30.5 Mbits/sec 107 sender
[ 9] 0.00-30.00 sec 108 MBytes 30.2 Mbits/sec receiver
[ 11] 0.00-30.00 sec 120 MBytes 33.5 Mbits/sec 98 sender
[ 11] 0.00-30.00 sec 119 MBytes 33.3 Mbits/sec receiver
[ 13] 0.00-30.00 sec 108 MBytes 30.2 Mbits/sec 101 sender
[ 13] 0.00-30.00 sec 107 MBytes 29.9 Mbits/sec receiver
[ 15] 0.00-30.00 sec 123 MBytes 34.3 Mbits/sec 104 sender
[ 15] 0.00-30.00 sec 122 MBytes 34.0 Mbits/sec receiver
[ 17] 0.00-30.00 sec 102 MBytes 28.5 Mbits/sec 104 sender
[ 17] 0.00-30.00 sec 101 MBytes 28.3 Mbits/sec receiver
[ 19] 0.00-30.00 sec 108 MBytes 30.2 Mbits/sec 108 sender
[ 19] 0.00-30.00 sec 107 MBytes 30.0 Mbits/sec receiver
[ 21] 0.00-30.00 sec 103 MBytes 28.8 Mbits/sec 105 sender
[ 21] 0.00-30.00 sec 102 MBytes 28.6 Mbits/sec receiver
[ 23] 0.00-30.00 sec 125 MBytes 34.9 Mbits/sec 96 sender
[ 23] 0.00-30.00 sec 124 MBytes 34.6 Mbits/sec receiver
[SUM] 0.00-30.00 sec 1.10 GBytes 316 Mbits/sec 1008 sender
[SUM] 0.00-30.00 sec 1.10 GBytes 314 Mbits/sec receiver

For each speedtest iPerf will add the above content to the text-file, so in theory it will could be added two-three times. Hope this helps.

I'm a new-bie to programming and have started learning classes. for my requirement i wrote a custom logging class and i'm trying to make the native functions of the logging module visible from another class on the same file. when i print dir(res) inside the customLogger it lists out all the native functions of the logging module . (as an exmaple info ()) but when i try to get the class object from another function, the native functions are not visibile.

The code that I had written is:

I need to run some tests with a traffic generator that has different client and server commands. I would like to roll this into a fabric2 script which executes the traffic generation commands while cd'd into /root.

I have public-key authentication on the iperf machines. How can I run this traffic generation test under fabric2?

I want to capture the iPerf result in a batch script. The last few lines of output are like

I am trying to fetch only top 5 lines of a command. The usual way would be to use head option but it is not working for all the commands. Below are some examples.

1. head option works for nping command.

I use iperf3.7 to measure the throughput of a system that is capable of around max 4 Gbps.

The iperf3 server is running on a Linux machine. I start the traffic with this command on the client side with the following flags, -R option to let the server send to the client: iperf3 -c 32.0.161.84 -u -l 1360 -b 550M -P 8 -w 16M -R -t 3000

Most of the times everything works as expected, I receive around 4 Gbps. But on some occasions, like 1-2 times of 10 iterations I receive lower throughput than expected. How much lower seem to be random, could be 2 Gbps or 3 or 3.5. When I get the low throughput scenario, it usually stays low for several minutes. Sometimes, after a couple of minutes it could recover by itself up to max speed and sometimes it stays low longer time. When I get this low throughput scenario, I can get a good throughput scenario if stopping the traffic and starting again and in this case the client side have received a new ip address as it’s dynamically assigned to the client on each iteration.

Looking at the printouts from sending server side it says it’s sending 8x550M and I have also checked with ifstat that also shows it sends 4400 Mbps.

Still receiving side receive lower speed.

Mirroring the ethernet card of the machine that the iperf client (sending side) is running on into wireshark shows there is a silent gap of 10.8 ms from time to time which can explain the received lower rate.

wireshark capture

In this example with wireshark, the traffic is 4.4 Gbps and then suddenly, it seems to be a silence gap for 10.8 ms and we lose 4486 ip frames with 1360 bytes. That can explain why the traffic decrease to 3 Gbps for a while.

Does anybody know if why this happens and if it is a known problem potentially fixed in later versions, 3.8 or 3.9? Any additional flag could be useful to avoid this scenario? I have tried to run the server on a different Linux machine, but same problem occur, so I don’t think it’s a problem on the machine itself.

BR Niklas

I am trying to run a Basic Publisher/Subscriber pair on the same Multicast/Port. It works perfectly when the hosts are connected to the same Switch, but not if the subscriber is on a different Switch.

Publisher

Simple application that scans Wi-Fi networks.

This one for a reference: Get available wi-fi scan result in customized listview

Just put a ListView in a layout and add ACCESS/CHANGE_WIFI_STATE permissions into manifest.

The problem is that it works on my Samsung J3 (2016), but I don't know why it doesn't on my new Samsung M11. Has it something to do with Android versions? I have already returned a Realme C3 that was having same issues because I thought it was due to Mediatek SOC.

SAMSUNG M11 (Android 10) LOG:

I want to deploy an Azure Ubuntu 18.04-LTS VM with a custom data file during an automation test, using tmplate.json and parameters.json files.

Although, the VM was deployed successfully, It seem that the custom data execution have failed and I do not understand why...

According to this link, cloud-init is available in the image that I use.

My template.json file contain: