The TTL can have a maximum value of 255 ( 8 bit header). TTL value gets decrement as the packet moves through every intermediary device on its way to its destination. Time-to-live (TTL) refers to the amount of time or “hops” that a packet is set to exist inside a network before it is discarded by a router. There is a lot of interesting and useful information you can learn from just analyzing TCP three-way handshake. In this post, I will focus on the TCP three-way handshake and share some tips & tricks I use to understand what is happening at the TCP/IP layer using Wireshark. Having a basic knowledge to analyze TCP packets can be a useful skill to have as a performance engineer. In this case however, the second image was only requested after the first image came back.There are times when I need to look at the TCP packets to help design a load test script or understand what is happening under the hood. Had they been running in parallel, both files would have been requested then would have returned in the same time period. I believe this to be the case because the first image was requested and sent before the second image was requested by the browser. The browser downloaded the two images in serially.Can you tell whether y our browser downloaded the two images serially, or whether they were downloaded from the two web sites in parallel? Explain. One each to each for each of the following: The initial page, the Pearson logo, and the cover of the Pearson book, 5th Edition. My browser sent 3 http GET message requests.How many HTTP GET request messages did your browser send? To which Internet addresses were these GET requests sent? Step 4: Stop Wireshark packet capture, and enter “http” in the display-filter-specification window, so that only captured HTTP messages will be displayed.ġ6. The image of the cover for our 5th edition (one of our favorite covers) is stored at the manic.cs. server. Our publisher’s logo is retrieved from the web site. As discussed in the textbook, your browser will have to retrieve these logos from the indicated web sites. That is, the images themselves are not contained in the HTML instead the URLs for the images are contained in the downloaded HTML file. These two images are referenced in the base HTML file. Step 3:Enter the following URL into your browser Your browser should display a short HTML file with two images. Step 2:Start up the Wireshark packet sniffer Step 1: Start up your web browser, and make sure your browser’s cache is cleared, as discussed above.

How to see images in wireshark pcap