DNS

What is the ‘nslookup’ command, and how can I use it?

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The nslookup command is a built-in network administration tool available on Windows, macOS, and many Linux distributions. It is used to query DNS servers to retrieve information about domain names, IP addresses, and DNS records. Basic Syntax: nslookup [hostname] [DNS server] Components: Common Use Cases: Example Output: Query a Domain: nslookup example.com Output: Server: dns.googleAddress: […]

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What is the ‘dig’ command, and how can I use it?

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The dig command, short for “Domain Information Groper,” in Linux or MacOS is a command-line tool used to query Domain Name System (DNS) servers. The command is a lot like nslookup, but at the same time it is different. If you are a Windows user, you have to use nslookup. For a reference on nslookup

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A Wireshark DNS Configuration Profile

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For those of you who love Wireshark and are needing to analyze DNS Queries and Responses, we have the profile for you. Profiles are one of the most important Wireshark capabilities.  Setting up and using different profiles for different environments, protocols, and tasks is a crucial skill that we teach in our Wireshark courses.  Let’s

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Using a Dynamic DNS Service Instead of a Public IP

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If you have a web/email server connected to the Internet that you want other to reach, that server must have a public IP address.  Most Internet users don’t even try to remember the IP addresses of sites they use, instead they use the Universal Resource Locator system of typing www.cellstream.com or something like this into

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