What is time sequence Stevens?
Time Sequence (Stevens) This is a simple graph of the TCP sequence number over time, similar to the ones used in Richard Stevens’ “TCP/IP Illustrated” series of books.
What is a time sequence graph?
The Time-Sequence graph shows a data stream over time. By definition, a stream is moving in one direction. The y-axis is TCP sequence numbers. Sequence numbers are representative of bytes sent. The sequence number increases by 1 for every 1 byte of TCP data sent.
What is slow start algorithm?
Definition. TCP slow start is an algorithm which balances the speed of a network connection. Slow start gradually increases the amount of data transmitted until it finds the network’s maximum carrying capacity.
How does Wireshark detect RTT?
To identify long RTT in Wireshark, ensure the Time column in Wireshark is configured to display the time since the previous displayed packet. Select View > Time Display Format > Seconds Since Previous Displayed Packet.
What does TCP DUP ACK mean?
duplicate acknowledgment
A duplicate acknowledgment is sent when a receiver receives out-of-order packets (let say sequence 2-4-3). Upon receiving packet #4 the receiver starts sending duplicate acks so the sender would start the fast-retransmit process. TCP actually regulates itself with packet loss as a feedback mechanism.
Why is TCP slow starting?
Slow start is part of the congestion control strategy used by TCP in conjunction with other algorithms to avoid sending more data than the network is capable of forwarding, that is, to avoid causing network congestion. The algorithm is specified by RFC 5681.
Why is TCP so slow?
TCP slow start is part of the congestion control algorithms put in place by TCP to help control the amount of data flowing through to a network. This helps regulate the case where too much data is sent to a network and the network is incapable of processing that amount of data, thus resulting in network congestion.
How is RTT calculated?
RTT is a complex metric that has several components. It includes propagation delay, processing delay, queuing delay, and encoding delay. The propagation delay is usually the dominant component in RTT and you can get a good estimate of RTT by a simple formula: RTT = 2 x Propagation delay.
What will happen if the RTT value is too high?
The least efficient of these is duplicated data. “Excessive packet round-trip time (RTT) detected” is a diagnostic that indicates that your network could be duplicating network traffic during busy periods, which in turn can lead to a traffic snowball effect.
Is TCP retransmission bad?
Retransmissions are a sure sign that the self-healing powers of the TCP protocol are working — they are the symptom of a problem, not a problem in themselves. The retransmission rate of traffic from and to the Internet should not exceed 2%. If the rate is higher, the user experience of your service may be affected.
How does the graph work in TCP Stevens?
The graphic portion of the TCP Stevens Graph view Layout consists of IP conversation lines of connected message nodes that correlate with y-axis sequence numbers, while the x-axis is calibrated to show message timestamps.
Is there a graph of the TCP sequence number?
This is a simple graph of the TCP sequence number over time, similar to the ones used in Richard Stevens’ “TCP/IP Illustrated” series of books. Shows TCP metrics similar to the tcptrace utility, including forward segments, acknowledgements, selective acknowledgements, reverse window sizes, and zero windows.
How is the number of diagnoses displayed in the Stevens graph?
This value is also reflected in the Stevens graph as the number of message nodes that display when you click a IP conversation segment line in the graph. Diagnoses — indicates the total number of diagnosis messages in each IP conversation segment. The higher this number, the more TCP issues are present in a particular conversation.
What does slow start mean in TCP time sequence graph?
Slow start is characterized by exponential growth, so it appears that on the 6th burst, the packets being sent between 1.0 and 1.1 seconds, that the exponential growth of packets being sent out has stopped and instead turned linear indicating it has entered congestion avoidance. Thanks for contributing an answer to Stack Overflow!