[ILUG] Disadvantages of CNAMEs

[Thomas Bridge]

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At 12:37 11/04/2002 +0100, you wrote:
>I read this somewhere, but I can't recall - what's the disadvantage of using
>a CNAME rather than another A record where you want two names for a host
>(I'm a long distance from my cricket book) ? I know an advantage is when you
>have to change IP addresses. I though the disadvantage was slightly more load
>somewhere but I can't remember where.

All CNAMES take a longer resolution time (if you look up a domain name 
which is a CNAME, you end up looking for a second domain name for the 
actually RR type you were looking for).

One major disadvantage is that some MTAs will barf on a CNAME in an MX 
record (but bind tends to yell at you in the logs if you put a CNAME in an 
MX record).

T.




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