It turned out that the DNS server was using outdated lists of root servers, causing it to fail in resolving specific domain names. ![]() By using the display filter, I was able to identify the problematic domain names and advise the client to reconfigure their DNS server accordingly. ![]() This pointed to a possible issue with their DNS server configuration.įurther analysis revealed that the client's DNS server was not responding to queries for certain domain names. Upon analyzing the captured packets, I noticed a high number of DNS queries with no corresponding responses. Using Wireshark, I captured their DNS traffic and applied the display filter dns. In this case, a client was experiencing slow website loading times and intermittent connectivity issues. ![]() Whether you're a network administrator or a cybersecurity professional, these examples will provide valuable insights and showcase the power of PacketSafari ( ) and our WIRED for Packet Analysis training course ( ).Ĭase Study 1: Identifying DNS Server Misconfiguration In this article, I'll share three real-world case studies that demonstrate how Wireshark can help you uncover the truth behind DNS-related issues. As a packet analysis expert, I've encountered numerous cases involving DNS (Domain Name System) analysis using Wireshark.
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