troubleshooting DNS

understanding the role of DNS and how DNS lookups are performed in your IS environment will lead to better operational security, visibility , response and sinkholing of malicious traffic, as well as overall understanding of the IS - information system dependencies.

we can use nslookup in a manual or automated ways (in computers anything that can be done manually using software can be automated)

nslookup set all (displays current session settings)

nslookup - 208.67.222.222 (sets your name server lookups to public opendns)

nslookup - 8.8.8.8 (sets your name server lookups to google global dns)

nslookup set type=any (allows to get more detailed information)

for more information on Windows OS nslookup

https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/nslookup

for more information on Linux / Unix OS nslookup options (man nslookup from CLI)

https://linux.die.net/man/1/nslookup

optionally you can use dig on Linux / Unix

https://linux.die.net/man/1/dig

#recursive vs #iterative #dns arcticle - https://www.cloudflare.com/learning/dns/what-is-recursive-dns/

#dns #lookups #troubleshoot #learn #compare