DNS issue

nesta1982 · 06-04-2009, 02:15 AM

How to prove that demonstrate that forward and reverse DNS is working?

win32sux · 06-04-2009, 07:12 AM

Quote:

Originally Posted by nesta1982

How to prove that demonstrate that forward and reverse DNS is working?

One way is to use the dig command.

Example for forward lookup:

Code:

dig example.com

Example for reverse lookup:

Code:

dig -x 123.123.123.123

See man dig for more advanced options you can throw at it.

grepmasterd · 06-04-2009, 01:23 PM

dig is a superior tool, but if you're looking for simple output you can try 'host'

Code:

host -t A example.com

Code:

host -t PTR 208.77.188.166

just giving some options...

farslayer · 06-04-2009, 01:44 PM

I like dig for testing purposes as well.. it tells you WHICH DNS server returned the query, and a host of other information about your query. dig also allows you to query a specific DNS server that may not be in your /etc/resolv.conf so you can test a DNS server you haven't made live.. or compare what multiple DNS servers return for a specific query.

definitely the best tool for testing / troubleshooting DNS imho