troubleshooting Question

Difference between IN A records and IN CNAME records

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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./
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