SRV on multiple subdomains

[Emmanuel Fusté]

Le 14/05/2024 à 15:08, DEMBLANS Mathieu a écrit :
>
> Hello,
>
> 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
>
> […]
>
> For example something like _/imap./_tcp.*.example.com  IN SRV 
> main.example.com.
>
> I read in a doc that the « * » can only be the  leftmost label in the 
> name.
>
> Is there an other way to simplify or does I have to add each entry 
> individually?
>
> I hope my question is clear enough, it’s not easy to explain.
>
> Thanks
>
> Mat
>
>

Avoid any use of wildcard.
In the present case you should not need it.
And if really needed, do provisioning. Wildcards are a true pandora's 
box. It is the "XSS" of the DNS.
Those who pretend to master all possible present and future practical 
side effects of a wildcard entry simply denote a lack of humility.

Emmanuel.