dns queries

Linux / UNIX: DNS Lookup Command

by Vivek Gite on November 8, 2010 · 5 comments

How do I perform dns lookup under Linux or UNIX or OS X operating systems without using 3rd party web sites for troubleshooting DNS usage?

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dnstop: Monitor BIND DNS Server (DNS Network Traffic) From a Shell Prompt

by Vivek Gite on August 4, 2008 · 8 comments

Q. How do I monitor my Bind 9 named (or any other dns server) server traffic / network traffic under Linux? How do I find out and view current DNS queries such as A, MX, PTR and so on in real time? How do I find out who is querying my DNS server or specific domain or specific dns client IP address?

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How To Set Caching DNS Server

by Vivek Gite on June 16, 2008 · 6 comments

How do I set caching dns server to speed up dns lookup for my LAN (500 PC)? The DNS lookups creating a lot of network activity. There are a few times when this causes performance issues. How do I configure caching dns under Debian Linux?

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How To Flush Linux / UNIX DNS Cache

by Vivek Gite on January 29, 2008 · 20 comments

Q. I’m on a Dial UP Internet connection under Linux and frequent dial up problem causing dns problems. How do I flush DNS cache under any UNIX / Linux distribution using a shell prompt?

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