Investigate Network Load: Difference between revisions

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Investigate Network Load (view source)

Revision as of 06:35, 20 May 2025

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Undo revision 5061 by Markus.Geissler (talk)
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(Undo revision 5061 by Markus.Geissler (talk))
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Open the web interface via a browser.
Open the web interface via a browser.


[[File:Investigate_network_load_dash.png|1000px|Allegro Network Multimeter Dashboard]]
[[File:Allegro Default Dashboard.png|1000px|Allegro Network Multimeter Dashboard]]


== Time Selection ==
== Time Selection ==
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{|  
{|  
| [[File:Investigate_network_load_time_select.png|300px|thumb|right]]
| [[File:Ap-mm-time-select-1-day.png|300px|thumb|right]]
|}
|}


In this case, we are looking for events from this morning. Now select the time period in which the users have reported
In this case, we are looking for events from this morning and I chose the previous
day's view. Now select the time period in which the users have reported
problems by selecting (click 'n drag) such section with the mouse:
problems by selecting (click 'n drag) such section with the mouse:


{|   
{|   
| [[File:Investigate_network_load_spike_select.png|600px|thumb|right]]
| [[File:Ap-mm-select-traffic-mouse.png|600px|thumb|right]]
|}
|}


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* Is there extremely low or no network traffic during this period? This may indicate link problems such as no connection to the Internet or to another network node.
* Is there extremely low or no network traffic during this period? This may indicate link problems such as no connection to the Internet or to another network node.


{|
In our example, Dropbox showed up with a total of 900 MB data transfer.
| [[File:Investigate_network_load_top_statistics.png|800px|thumb|right]]
By clicking on "Dropbox" I can easily see an overview of who triggered this
|}
traffic:
 
Let’s check by clicking on ‘Top protocols during selected interval’ for the cause of the slow connection.<br>
In our example, ‘WindowsUpdate’ showed up as one of the culprits.  


{|
{|
| [[File:Investigate_network_load_L7.png|800px|thumb|right]]
| [[File:Ap-mm-dropbox.png|600px|thumb|right]]
|}
|}


By clicking on ‘WindowsUpdate’ under ‘Protocol’ you can easily see an overview of who triggered this traffic:
Here, the computer "nb-nina.allegro" generated both uploads and downloads
to Dropbox with rates up to 40 MBit/s. This can lead to user disruption caused by
the uploads and downloads, allowing you to take further action.


{|
By clicking on the IP address, then on the tab "Connections" you can sort the
| [[File:Investigate_network_load_protocol_winupdate.png|800px|thumb|right]]
connections by TCP retransmission:
|}


Here, the machines ‘adguard.intra.allegro-packets.com’ and ‘archlinux‘ generated spikes with both uploads and downloads, which can lead to user disruption.<br>
{|  
By clicking on an IP address (in our example ‘10.41.16.110’), you can further investigate the causes and even look into the IP’s connections:
|  
 
[[File:Ap-mm-connection-retransmissions.png|600px|thumb|right]]
{|
| [[File:Investigate_network_load_ip_statistics.png|800px|thumb|right]]
|}
|}


Under the ‘Connections’ tab you will find all connections the selected IP has made in the selected timeframe and you can even see the amount of TCP retransmissions that have been made<br>
You can use the number of retransmission to estimate if there was a bottleneck
(to see the TCP retransmissions you might have to enable this option in your filter).  
between the Allegro Network Multimeter and the recipient and if more packets had to be retransmitted.
 
Here in our example, there were 1.4 percent (6MB of 448,2MB) retransmissions with an approx. 12 MBit/s
{|
(upload) to Dropbox. Possibly the uplink was busy at this point and dropped several TCP packets.
| [[File:Investigate_network_load_ip_connections.png|800px|thumb|right]]
|}


You can use the number of retransmission to estimate if there was a bottleneck between the Allegro Network Multimeter and the recipient and if more packets had to be retransmitted.<br>
If you need an even more detailed analysis, you can use the pcap button to extract the connection packets.
If you need a even more detailed analysis, you can use the pcap button to extract the connection packets.<br>
 
{|
| [[File:Investigate_network_load_pcap_download.png|800px|thumb|right]]
|}
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