DNAME usage?

[Mark Andrews]

Alternatively use a http server that can update the records for the interfaces it is listening on. 

This sort of thing is possible. Named gets informed by the OS when addresses get added and removed. It currently just adds and removes listening sockets but you could trigger other actions like sending dynamic dns updates.

Unless you ask for the functionality it won’t be added.


--
Mark Andrews

> On 18 Nov 2017, at 06:38, Mark Andrews <marka at isc.org> wrote:
> 
> 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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