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$ curl repovive.com/roadmaps/network-design/troubleshooting-methodology/using-nslookup-and-dig

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$ curl repovive.com/roadmaps/network-design/troubleshooting-methodology/using-nslookup-and-dig

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Using Nslookup and Dig - Troubleshooting Methodology | Network Design | Repovive

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Network Design26 sections · 911 units44h total

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Using Nslookup and Dig

DNS query tools

Nslookup and dig query DNS servers directly. They help you diagnose name resolution problems.

Nslookup usage:

nslookup google.com
nslookup google.com 8.8.8.8
nslookup -type=MX company.com

Dig usage (more detailed):

dig google.com
dig @8.8.8.8 google.com
dig google.com +trace

What to check:

Does your DNS server respond?
Does it return the expected IP address?
Does a public DNS server give different results?

Server not responding means DNS server down. NXDOMAIN means name does not exist.