[CentOS] Split dns issues

Jason Pyeron jpyeron at pdinc.us
Mon Aug 3 14:27:52 UTC 2009


> -----Original Message-----
> From: centos-bounces at centos.org 
> [mailto:centos-bounces at centos.org] On Behalf Of Filipe Brandenburger
> Sent: Monday, August 03, 2009 10:10
> To: CentOS mailing list
> Subject: Re: [CentOS] Split dns issues
> Hi,
> On Sun, Aug 2, 2009 at 15:16, Jason Pyeron<jpyeron at pdinc.us> wrote:
> > Now we want to just override the MX records for pdinc.us without 
> > having to merge or manage all the records for every 
> entry/subdoamin in 
> > the zone file for pdinc.us.
> Why don't you just set the MX records of pdinc.us to 
> something inside mail.pdinc.us? Then both your outside and 
> inside will see the same name, but you can resolve them to 
> different IPs inside mail.pdinc.us depending on being on the 
> inside or outside network. If you want something other than 
> MX records, you can use CNAMEs to something in a subdomain 
> for which you will use "views", and then on the subdomain 
> resolve to different IPs depending on the query being 
> internal or external... Would that work for you?

My worry is the A record for the outsourced mail service is out of our control,
if it were to change it would be catastrophic.

I like the idea about the cname. Can a cname be used as a host for a MX record?
The other fear is the outsourced (showing ignorance on SMTP here) might react
badly to the client making a connection to a server with a name different than
they expected, as it looks like they are doing a name based virtual hosting.

I will look in to it.



-                                                               -
- Jason Pyeron                      PD Inc. http://www.pdinc.us -
- Principal Consultant              10 West 24th Street #100    -
- +1 (443) 269-1555 x333            Baltimore, Maryland 21218   -
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