Apply a filter for SYN/ACK packets that contain window scaling options. TCP Fast Retransmission - Occurs when the sender retransmits a packet before the expiration of the acknowledgement timer. (2 points) Step 5: Filter TCP traffic based on window scaling option. TCP Retransmission - Occurs when the sender retransmits a packet after the expiration of the acknowledgement. 4.1 Why are certain SYN packets are colored in green and others in gray. Because the TCP sequence numbers are clearly wrong, having a constant value of 1 for all packets (which explains why Wireshark doesn't bother inspecting the packet in deeper detail because a TCP packet bearing an already used sequence number and non-zero payload size cannot be anything else but a retransmission), so I wonder how something like. It is saying that the server IP is performing a TCP Retransmission to the client. I did a sniff and attached is the traffic. In this hands-on video, make sure to download the pcap below so you can follow along. But it will keep trying to go faster until it suffers loss, which causes it to back off. TCP Retransmission on Wireshark Go to solution Ken Lee Beginner Options 03-20-2017 12:17 AM - edited 03-08-2019 09:49 AM Hi Currently my users are having some issues on slowness when connecting to the server. In this video we are going to dive into TCP duplicate ACK analysis. In fact, TCP is designed to go too fast, suffer loss, which causes TCP to slow down so that it might go as fast as possible in the steady state. o tcp. To view metadata of a frame in the frame section, click on the frame in the packet details pane. An occasional TCP retransmission is nothing to worry about. NOTE: Metadata can be viewed in the frame section. 3.1 Which packets are colorized and why? (3 points) Step 4: Use Wireshark default coloring rules and frame metadata. On the given trace file, examine the packets that have been colorized with Wireshark’s bad TCP coloring rules. 2 Facing issues due to TCP Port Reuse and Retransmission for HTTP traffic. 2.1 What is the syntax of this filter? (4 points) 2.2 How many packets matches the TCP SYN filter? (2 points) Step 3: To analyze traffic coloring rules, study Wireshark coloring rules. Apply a filter to display only packets with the TCP SYN bit set on. Step 1: Download and open the trace file “wwb001 - syns.pcapng” Step 2: Display only TCP SYN packets. 4 Activity 1 Tasks Use key functions in Wireshark to observe and explore TCP traffic.
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