CNAME or A record?

[Lightner, Jeff]

Right – for simple domains I think having separate A records is best as I wrote.  Many more complex domains (do digs on www.google.com<http://www.google.com/>, www.yahoo.com<http://www.yahoo.com/> and www.microsoft.com<http://www.microsoft.com/>) use CNAME records but often enough it is because they aren’t actually using a www.example.com<http://www.example.com/> pointing directly to example.com but rather to other servers in their domains.






________________________________
From: Ben Croswell [mailto:ben.croswell at gmail.com]
Sent: Wednesday, September 28, 2011 10:48 AM
To: feralert
Cc: bind-users at isc.org; bind-users at lists.isc.org; Lightner, Jeff
Subject: Re: CNAME or A record?


Either is fine. Using the cname would require a single update if your ip changes, but prevents other records at the same level. So you couldn't attach mx for instance at example.com<http://example.com> and www.example.com<http://www.example.com> if you wanted to.

Neither is wrong and both have pros and  cons

-Ben Croswell
On Sep 28, 2011 10:43 AM, "feralert" <feralert at gmail.com<mailto:feralert at gmail.com>> wrote:
> Thanks Jeff,
>
> But I really only wrote that as an example :) . The real question is
> what is best or what is recommended, two A RR (one for domain, one for
> www) or a single A RR for domain and a CNAME RR for www, is one way
> better than the other or can I choose either way?
>
> Cheers!,
> Fred.
>
>
>
> On Wed, Sep 28, 2011 at 4:30 PM, Lightner, Jeff <JLightner at water.com<mailto:JLightner at water.com>> wrote:
>> If you set your SOA properly to use "@" (which means "this zone") your A records should be:
>>
>> domain.com<http://domain.com>.             A       1.1.1.1
>> www                     A       1.1.1.1
>>
>> The SOA should append the "domain.com<http://domain.com>" to every record not terminated by a dot so that "www" is read as "www.domain.com<http://www.domain.com>".  Similarly you put a dot at the end of domain.com<http://domain.com> A record to prevent it from being appended and read as domain.com.domain.com<http://domain.com.domain.com>.
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: bind-users-bounces+jlightner=water.com at lists.isc.org<mailto:water.com at lists.isc.org> [mailto:bind-users-bounces+jlightner<mailto:bind-users-bounces%2Bjlightner>=water.com at lists.isc.org<mailto:water.com at lists.isc.org>] On Behalf Of feralert
>> Sent: Wednesday, September 28, 2011 10:20 AM
>> To: bind-users at isc.org<mailto:bind-users at isc.org>
>> Subject: CNAME or A record?
>>
>> Hi all,
>>
>> I'm sure this has been asked trillions of times but since I couldn't
>> find any concrete answer/reference in google I am asking you guys in
>> this list. Sorry if anyone thinks this a dumb question or something
>> very obvious.
>>
>> The thing is that i want users redirected to 'www.domain.com<http://www.domain.com>' even
>> when they just type the domain name 'domain.com<http://domain.com>'.
>> In order to do so I am not sure if its best to have one A RR for each
>> or have an A RR for the domain and a CNAME RR pointing to 'domain.com<http://domain.com>'
>> for 'www.domain.com<http://www.domain.com>'.
>>
>>
>> domain.com<http://domain.com>           A            1.1.1.1
>> www.domain.com<http://www.domain.com>   A            1.1.1.1
>>
>> OR
>>
>> domain.com<http://domain.com>           A            1.1.1.1
>> www.domain.com<http://www.domain.com>   CNAME  domain.com<http://domain.com>
>>
>>
>> Any help appreciated.
>>
>>
>> Thanks,
>> Fred
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>>
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