DNAME usage?

[Mark Andrews]

Just have the machine hosting the http server do a dynamic update of the A ana AAAA records when they are assigned to the interface.

It should be possible to get the os to run a program when this happens so it can perform a second dynamic update on a the different name. 

-- 
Mark Andrews

> On 18 Nov 2017, at 04:19, Jeff Sadowski <jeff.sadowski at gmail.com> wrote:
> 
> I am a bit confused by DNAME's
> I had used them before but I may have used them wrong.
> 
> On windows 2008r2 I have some zone's where I create a DNAME for the
> root and point it to an A record.
> 
> IE:
> 
> zone bla.bla
> SOA <standard SOA>
> NS <mydns>
> DNAME www.bla.com
> 
> where www.bla.com is an A record.
> 
> the reason I was doing this is because www.bla.com has a dhcp assigned address
> 
> and I want bla.bla to always point to it.
> windows dns does not allow a cname at the root of a zone.
> 
> as of 2012r2 with updates this no longer works.
> 
> So I decided to see what bind would do with DNAME If I tried a similar
> experiment
> I have a db.self file I used when I want certain outside addresses to
> point back to my inside addresses.
> 
> my db.self file looks like so
> 
> 
> $TTL 3D
> @  1D  IN  SOA ns jeffsadowski.gmail.com. (
>                              2017081201 ;
>                              3H ;
>                              15 ;
>                              1w ;
>                              3h ;
>                             )
> @ IN NS ns
> ns IN A 192.168.1.252
> @ IN A 192.168.1.252
> 
> And I wand similar for my DNAME so I created db.dname that looks like so
> 
> $TTL 3D
> @  1D  IN  SOA ns jeffsadowski.gmail.com. (
>                              2017081201 ;
>                              3H ;
>                              15 ;
>                              1w ;
>                              3h ;
>                             )
> @ IN NS ns
> ns IN A 192.168.1.252
> @ IN DNAME methanemaker.mooo.com
> 
> then when I try and start bind I get error messages like so
> 
> Nov 17 09:55:53 methanemaker bash[7049]: zone bla.bla/IN: NS
> 'ns.bla.bla' is below a DNAME 'bla.bla' (illegal)
> Nov 17 09:55:53 methanemaker bash[7049]: zone bla.bla/IN: not loaded
> due to errors.
> 
> I tried without the NS likes and I get this message
> 
> Nov 17 09:48:36 methanemaker bash[4872]: zone bla.bla/IN: has no NS records
> Nov 17 09:48:36 methanemaker bash[4872]: zone bla.bla/IN: not loaded
> due to errors.
> 
> If anyone has a better idea how to map to a dhcp addressed machine
> from a zone I'd like to know?
> 
> I don't want to recreate the entire superdomain for just one record
> that needs changed
> IE:
> the super domain is managed by an outside service. I don't want to
> keep a second copy inside that has a few with different records.
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