pointing subdomain to IP

im running a server on fedora core 3
i want to point a subdomain to a different IP.

i tried editing the host file with:

sub.domain.com. 14400 IN A xx.xx.xxx.xx

but it doesn't work, is there a delay? its been over a day.
if so, how do i speed up the process?

does anyone know exactly the host file i should be editing? there are a couple in /var/named so im not sure im editing the correct one,.

thanks

 

 

 

 

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