MyDNSMon

Mainly designed for network administrators and tech-savvy users with an interest in networking, MyDNSMon delivers a lightweight but interesting application that listens for DNS packets throughout an Ethernet connection and retrieves information about the sender and the destination, as well as DNS queries and responses.

MyDNSMon only works in the command console, using the capabilities of Npcap to capture network packets and display details about packet contents. Needless to say, a recent version of Npcap needs to be installed on the local system for MyDNSMon to work.

Upon launch, MyDNSMon searches for the presence of Npcap and, if the requirement is fulfilled, it scans for available network interfaces, revealing them all in a list. Each interface has a associated number and the first thing you need to do is enter the number of the interface you want MyDNSMon to monitor. Please note that only Ethernet networks are supported.

Once you do so, the application starts monitoring and listening for DNS packets that are being transmitted throughout the selected network. To make the application stop monitoring, you either close it or hit the CTRL + C key combination.

When a packet is detected, MyDNSMon automatically displays detailed information about it in the command console window. By default, it reveals the detection time, the source and the destination IP addresses and port numbers, the domain queried and the query responses. The output can be saved to file.

There are a few additional parameters you can use. Adding “/basic” as a parameter will also include response types, while additional details, such as the UDP header, the protocol type, the query / answer count and the answer class are added using the “/detail” parameter. To shorten the process and show all the fields included in the DNS packets, you simply have to add “/all” as an argument to the main executable.

MyDNSMon came to life as a result of troubleshooting DNS resolution and allows network administrators to see responses for each DNS query. Not only that it can display all the fields in the DNS packet, but you can also write all this information to file.