SRV on multiple subdomains

[Niall O'Reilly]

On 14 May 2024, at 15:20, DEMBLANS Mathieu wrote:

> A part of the subdomains are managed by us, others subdomains by an 
> other entity.
> So we can't configure a generic target for all subdomains as each 
> entity has its own target for SRV entries.
>
> -----Message d'origine-----
>
> De : bind-users bind-users-bounces at lists.isc.org De la part de Matus 
> UHLAR - fantoms
> Envoyé : mardi 14 mai 2024 15:58
> À : bind-users at lists.isc.org
> Objet : Re: SRV on multiple subdomains
> On 14.05.24 13:08, DEMBLANS Mathieu wrote:
>
> I have a question about configuration simplification for SRV 
> configuration (maybe it can be applyed for other entries).
>
> We manage multiple subdomain of a main one (server1.example.com, 
> server2.example.com,...).
> For A and MX entries, we use a general domain definitions with 
> wildcard but is there a way to do so for SRV without having to define 
> all subdomains (we have several dizains of it) ?
>
> We have to define some SRV entries with the same target like :
> _imap._tcp.server1.example.com IN SRV main.exemple.com
> _imap._tcp.server2.example.com IN SRV main.exemple.com

Since a record is needed for each host, I think I would use something 
like this:

     imap._tcp.server1.example.com. IN SRV main.example.com.
     imap._tcp.server2.example.com. IN CNAME 
imap._tcp.server1.example.com.
     ...
     imap._tcp.servern.example.com. IN CNAME 
imap._tcp.server1.example.com.

The advantage here is that, if ever the target of the SRV record had to
be changed, only one record would have to be updated.

/Niall
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