Debugging MS Teams Traffic: Difference between revisions

Debugging MS Teams Traffic (view source)

Revision as of 09:48, 11 May 2020

31 bytes removed , 11 May 2020

→‎Skype control traffic

David.Griffiths

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 == Skype control traffic ==
-The Skype control traffic is SSL encrypted. This does not allow to decode and analyse the content of the control connection. As SSL uses the TCP as layer 4 protocol, all quality statistics of the TCP connection can be used for debugging. Additionally, the response time for the SSL handshake and the first encrypted SSL data response time is available too.
+Skype control traffic is SSL encrypted. This does not allow for decoding and analysis of the control connection content. Since SSL uses TCP as the Layer 4 protocol, all of the TCP connection quality statistics can be used for debugging. Additionally, the response time for the SSL handshake and the first encrypted SSL data response time is available.
 The most important quality parameters are:
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 * TCP handshake response time
 * TCP retransmission rates
-* TCP Zero window times
+* TCP Zero Window times
 * SSL hello handshake respone time
 * SSL first data response time
-Please read the [[TCP module]] and [[SSL module]] for more information about these and more counters.
+Please read the [[TCP module]] and [[SSL module]] for more information on these and more counters.
-A simple way to get an overview of the response time for Skype servers is the '''IP statistics''' table. You can use the free text search for "skype" and select the the graph dialog: "TCP response time". This will present you the top IP addresses with a correlated name to '''skype''' and their TCP response time. You can also enable the '''Timing''' columns to view and sort for response times.
+A simple way to see an overview of the response time for Skype servers is the '''IP statistics''' table. You can use the free text search for "skype" and select the the graph dialogue: "TCP response time". This will present you the top IP addresses with a correlated name to '''skype''' and their TCP response times. You can also enable the '''Timing''' columns to view and sort for response times.
 [[File:Skype response time.png|600px]]
-This graph shows you the delay of the TCP stack to confirm the reception for data. Please note that many TCP stacks wait a few milliseconds if there is no data to respond (see [[https://en.wikipedia.org/wiki/TCP_delayed_acknowledgment Wikipedia TCP delayed acknowledgment]]). Any additional delay on top of this time (usually 40 ms) shows a significant delay in the roundtrip time. If you have installed the Allegro close to the Skype client, it will be the roundtrip time of the TCP packets from your network to the Skype cloud.
+This graph shows you the TCP stack delay to confirm data reception. Note that many TCP stacks wait a few milliseconds if there is no data to respond to(see [[https://en.wikipedia.org/wiki/TCP_delayed_acknowledgment Wikipedia TCP delayed acknowledgment]]). Any additional delay on top of this time (usually 40 ms) indicates a significant roundtrip time delay. If you have installed the Allegro close to the Skype client, it will be the roundtrip time of the TCP packets from your network to the Skype cloud.
-The used DNS names and IP address ranges can differ for Skype as the control server are made available in the Microsoft cloud with load balancing leading to different servers. A current description for Skype for Business can be found here: [https://techcommunity.microsoft.com/t5/skype-for-business-blog/simplified-port-requirements-for-skype-for-business-online/ba-p/77094]
+DNS names used and IP address ranges can differ for Skype since the control servers in the Microsoft cloud use load balancing which can point data to different servers. A current description for Skype for Business can be found here: [https://techcommunity.microsoft.com/t5/skype-for-business-blog/simplified-port-requirements-for-skype-for-business-online/ba-p/77094]
-The analysis can also be done for TCP retransmissions and TCP zero window statistics. If you have installed the Allegro close to the Skype client, this will indicate if the data sent to the Skype server required a retransmission on the WAN link or if the receiver buffer is full showing receiver overload.
+The analysis can also be done for TCP retransmissions and TCP Zero Window statistics. If you have installed the Allegro close to the Skype client, this will indicate if the data sent to the Skype server required a retransmission on the WAN link or if the receiver buffer is full, indicating receiver overload.
 == Skype audio/video traffic ==