[geeks] DNS: CN & A records

[Kevin]

Thanks for the info.

BTW: i do create multiple PTR records, but then i only have a handful of
hosts to deal with.

/KRM

On Thu, 23 Jun 2005 20:01:11 +0100
Mike Meredith <mike at redhairy1.demon.co.uk> wrote:

> On Thu, 23 Jun 2005 11:41:44 -0400 (EDT), Kevin wrote:
> > Regarding DNS configuration, i see some people using multiple A
> > records as opposed to one A record and multiple CN records?  Is there
> > any reason for this?
> 
> As in :-
> 
> dns0	IN A 148.197.254.1
> mail	IN A 148.197.254.1 
> 
> ?
> 
> You can't use CNAMEs on the right hand side of a resource record (i.e.
> "port.ac.uk. IN NS dns0.port.ac.uk." would be invalid). Lazy hostmasters
> (/me looks guilty) tend to avoid CNAMEs to avoid making stupid mistakes.
> 
> > I always thought you were supposed to have one A record per IP and
> > then use CN records for additional aliases.
> 
> Nope. You can have as many A records pointing to an IP as you wish. In
> theory you should have multiple PTR records pointing back to every name
> that points to the IP :-
> 
> 1.254.197.148.in-addr.arpa. IN PTR dns0.port.ac.uk.
> 1.254.197.148.in-addr.arpa. IN PTR mail.port.ac.uk.
> 
> In practice it isn't usually done, and pretty much nobody cares ...
> except for a certain Greg who used to live on these lists.
> 
> (I'm deliberately ignoring IPv6)
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