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TCP module (view source)

Revision as of 12:07, 6 May 2020

2,220 bytes removed ,  6 May 2020
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'''Per IP statistics'''
=== Per IP statistics ===


It is possible to select an IP from the list of IP addresses and get an more detailed view of the information stored about that IP.
It is possible to select an IP from the list of IP addresses and get an more detailed view of the information stored about that IP.
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== TCP response time ==
'''TCP response time'''
 
This tab shows the continuous measurement of TCP response times. The time measured is the interval between a transfer of data and the respective acknowledgement.
The graph on the top shows a minimum, maximum and average response time over all TCP connections observed.
The IP list below shows the minimum, maximum and average response time for each IP address.
 
 
 
'''TCP retransmissions'''
 
This tab shows all IP addresses with TCP traffic and the aggregated amount of TCP payload sent and received and the amount of data that needed to be retransmitted due to packet loss.
 
 
'''TCP server with invalid connections'''
 
Here a list of all servers with invalid connections is shown. Connections are counted as invalid if the handshake fails or no data is transferred at all.
Each line shows the number of invalid connections and the number of valid connections for a certain TCP server.
 
 
 
'''TCP flags'''
 
This tab shows the occurence of certain TCP flags. Packets with the following flags are counted:
 
* TCP SYNs: TCP packets where the SYN flag is set but not the ACK flag
* TCP SYN-ACKs: TCP packets where the SYN flag and the ACK flag is set
* TCP FINs: TCP packets where the FIN flag is set
* TCP RSTs: TCP packets where the RST flag is set
 
A graph shows the number of packets for each tracked flag type over time. The IP list below the graph shows the number of sent and received TCP packets for each tracked flag type per IP.
 
 
'''TCP zero window'''
 
This tab shows the occurence of TCP packets that signal a window size of zero. This usually means that the TCP receive buffer of the system sending the zero window packet is filled up and the system cannot receive any more data for that connection.
A graph shows the global number or TCP zero window packets over time. The IP list below the graph shows the number of sent and received TCP zero window packets for each IP.
 
 
'''Configuration settings'''
 
The TCP connection information rely on the IP module to store connections for each IP address. This feature takes significant amount of memory and can be disabled in the IP module configuration.
The button at the bottom of the page leads to the corresponding configuration section.
'''TCP response time'''


This tab shows the continuous measurement of TCP response times. The time measured is the interval between a transfer of data and the respective acknowledgement.
This tab shows the continuous measurement of TCP response times. The time measured is the interval between a transfer of data and the respective acknowledgement.
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'''TCP retransmissions'''
== TCP retransmissions ==


This tab shows all IP addresses with TCP traffic and the aggregated amount of TCP payload sent and received and the amount of data that needed to be retransmitted due to packet loss.
This tab shows all IP addresses with TCP traffic and the aggregated amount of TCP payload sent and received and the amount of data that needed to be retransmitted due to packet loss.




'''TCP server with invalid connections'''
== TCP server with invalid connections ==


Here a list of all servers with invalid connections is shown. Connections are counted as invalid if the handshake fails or no data is transferred at all.  
Here a list of all servers with invalid connections is shown. Connections are counted as invalid if the handshake fails or no data is transferred at all.  
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'''TCP flags'''
== TCP flags ==


This tab shows the occurence of certain TCP flags. Packets with the following flags are counted:
This tab shows the occurence of certain TCP flags. Packets with the following flags are counted:
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'''TCP zero window'''
== TCP zero window ==


This tab shows the occurence of TCP packets that signal a window size of zero. This usually means that the TCP receive buffer of the system sending the zero window packet is filled up and the system cannot receive any more data for that connection.
This tab shows the occurence of TCP packets that signal a window size of zero. This usually means that the TCP receive buffer of the system sending the zero window packet is filled up and the system cannot receive any more data for that connection.
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'''Configuration settings'''
== Configuration settings ==


The TCP connection information rely on the IP module to store connections for each IP address. This feature takes significant amount of memory and can be disabled in the IP module configuration.  
The TCP connection information rely on the IP module to store connections for each IP address. This feature takes significant amount of memory and can be disabled in the IP module configuration.  
The button at the bottom of the page leads to the corresponding configuration section.
The button at the bottom of the page leads to the corresponding configuration section.
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