[CentOS] DNS wizard

Tue Jan 3 20:03:50 UTC 2006
Maciej Żenczykowski <maze at cela.pl>

> But there is no down side to a CNAME as long as you remember
> that it really is an alias for the target name and thus inherits
> any other data (like MX records) associated with it.

The downsides to CNAMEs is that they increase look-up times - instead of 
getting an IP, you get a hostname which you have to look-up - again (ie. 
basically if your unlucky it's double the hostname -> IP/MX/whatever 
lookup time).  ie. back to square one.  Furthermore anything which is a 
CNAME point to a CNAME is dangerous - and those have a tendency to 
automagically crop up.  Depending on the DNS library/cache etc you are 
using already 3 CNAME's in a row may result in failed lookups (others have 
higher limits - sometimes 4 sometimes as high as 10, sometimes none...)

Cheers,
MaZe.