DNS Zone question for sub domains

Hi:
I have a subdomain sub.mysite.com that's hosted on a different server from mysite.com, using a A record redirect in the DNS Zone file in WHM:

sub | A Record | destination_IP

The problem is, while:

sub.mysite.com

resolves, if I type:

www.sub.mysite.com

it doesn't. My question is, do I need to also add:

www.sub | A Record | destination_IP

to the DNS Zone file? This is never mentioned in tutorials, so I'm not sure I'm on the right path here.

Thanks,

 

 

 

 

Top