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One of the biggest advantages of using a network analysis tool with a reporting facility is the ability to aggregate and summarize specific characteristics to save you time and brain cells. For example, Wireshark has a lot of information you can reference or leverage when troubleshooting or baselining.
To demonstrate this, I'll show you how I recently resolved a problem a client was having trying to trace a webpage error. Using Wireshark, engineers at the customer site went to Statistics-> HTTP-> Packet Counters and did not see any errors even though they could obviously see an error clearly referenced on their screen. I explained that in this case, the word "error" needs to be properly explained.
Wireshark reports errors from a HTTP protocol perspective, but unfortunately their issue was that there was an actual webpage displayed with the error message. This can get a bit confusing, but as far as HTTP is concerned, the error page being returned is a valid page, therefore no error is reported.
The best analogy I can provide is when the mailman delivers you an overdue bill, he doesn’t know the details or situation, all he knows is that he delivered the mail.
I explained they need to dig deeper to find the error, and started with a protocol filter (HTTP). After I found the packet with the error message, I leveraged a specific Display Filter to save time.
The client had originally suggested using the Find feature with the String/Bytes option. I agreed that would work, but it would be much easier if they could use a Display Filter so the only packets remaining on the screen are the offending packets.
Tim Schreyack, Director of Sales Engineering, Network to Code
December 04, 2023
Simplified network automation can help organizations more effectively manage resources, offer data insights to better understand a network and workflows, and transform the planning, deployment, and operations of a network.