Simple question about zone and CNAME

Sam Wilson Sam.Wilson at ed.ac.uk
Wed Apr 24 15:38:36 UTC 2013


In article <mailman.78.1365430543.20661.bind-users at lists.isc.org>,
 Phil Mayers <p.mayers at imperial.ac.uk> wrote:

> On 08/04/13 14:46, Sam Wilson wrote:
> > In article <mailman.59.1365230565.20661.bind-users at lists.isc.org>,
> >   Phil Mayers <p.mayers at imperial.ac.uk> wrote:
> >
> >> Sam Wilson <Sam.Wilson at ed.ac.uk> wrote:
> >>
> >>> [adding an A record for ed.ac.uk.]
> >>>
> >>
> >> If your AD realm is also called ed.ac.uk then adding an A record will
> >> definitely affect things.
> >
> > Which is exactly the opposite of what our AD guys said, but not with
> > such great conviction.  :-)
> 
> Off the top of my head the two most recent issues we've had.
> 
> 1. If you don't have a domain controller A record at your AD realm name, 
> you'll experience sporadic timeouts and slowness if you ever want to 
> roll out DFS, particularly if your domain members include non-Microsoft 
> clients such as Macs
> 
> 2. If you put something else at that place, you'll see SMB connection 
> attempts and if they fail but port 80 is open, you'll see Windows trying 
> to do WebDAV requests (!) to it.
> 
> Both these and other issues make me wish we'd chosen a sub-domain for 
> our AD realm when we migrated from NT4. But we had no way of knowing at 
> the time :o(

Thank you (belatedly) for that information.  As I think I remarked 
elsewhere we wished to retain the existing structure of our DNS, with 
some domains delegated to others (as well as a lot that we delegate to 
ourselves) which needed to be in the same AD thingy[*].  Forcing another 
layer of DNS naming between the institution and the department seemed 
inappropriate.

Sam

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