Upon inspecting the captured packets, I found several DNS responses with mismatched query and response domain names. To investigate, I used Wireshark to capture DNS traffic on their network and applied the display filter = 1 & = 1 & = 1. After updating the DNS server's configuration, the client's connectivity issues were resolved, and their website loading times significantly improved.Ĭase Study 2: Detecting DNS Cache PoisoningĪ client suspected that their network was being targeted by a DNS cache poisoning attack, causing their customers to be redirected to malicious websites. It turned out that the DNS server was using outdated lists of root servers, causing it to fail in resolving specific domain names.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.

Wireshark dns analysis