troubleshooting Question

Difference between IN A records and IN CNAME records

Avatar of multisites
multisites asked on
Linux
7 Comments1 Solution506 ViewsLast Modified:
Hi:

I need to solve a real doubt before making modifications at my DNS in a Linux Server.

All my domains files at /var/named have lines like these:

www IN A 200.157.211.200
ftp IN A 200.157.211.200
mail IN A 200.157.211.204
smtp IN A 200.184.161.136

I was asked by the ISP to modify them to some like these:

www IN CNAME srv1.multisitesdominios.com.br.
ftp IN CNAME srv1.multisitesdominios.com.br.
mail IN CNAME srv2.multisitesdominios.com.br.
smtp IN CNAME srv6.multisitesdominios.com.br.

They say that in this way I will not be dependent on any IP modification they do. My questions:

No problem about this? Wouldn't my DNS work more slowly? Please I would like to know, technically, what is the difference between "IN A" records and "IN CNAME" records.

Thanks.

Mario./
Join the community to see this answer!
Join our exclusive community to see this answer & millions of others.
Unlock 1 Answer and 7 Comments.
Join the Community
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 1 Answer and 7 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros