Re: SRV on multiple subdomains
Adding my 2p, I would take that principle a step further. Create a generic, unique SRV record that represents what you want to happen. Then create specific CNAME records for each server. The reasons for the extra, generic record are that it represents the service you want to offer and all "server.." records you want to use that service are identical in structure. e.g. imap-tcp-service.example.com. SRV _imap._tcp.server1.example.com. CNAME imap-tcp-service.example.com. _imap._tcp.server2.example.com. CNAME imap-tcp-service.example.com. ... _imap._tcp.server999.example.com. CNAME imap-tcp-service.example.com. and so on. Cheers, Greg On Thu, 16 May 2024 at 11:43, Niall O'Reilly wrote: > 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-boun...@lists.isc.org De la part de Matus > UHLAR - fantoms > Envoyé : mardi 14 mai 2024 15:58 > À : bind-users@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 > -- > Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe > from this list > > ISC funds the development of this software with paid support > subscriptions. Contact us at https://www.isc.org/contact/ for more > information. > > > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users > -- Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
Re: SRV on multiple subdomains
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-boun...@lists.isc.org De la part de Matus UHLAR - fantoms Envoyé : mardi 14 mai 2024 15:58 À : bind-users@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 -- Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
Re: SRV on multiple subdomains
On 14.05.24 14:20, DEMBLANS Mathieu wrote: A part of the subdomains are managed by us, others subdomains by an other entity. If you really have multiple subdomains for exanmle.com managed by different entities, then yes, wildcard is not good idea. This applies to A and MX records as well. So we can't configure a generic target for all subdomains as each entity has its own target for SRV entries. You can't even setup wildcard for *.example.com to provide server1.example.com A/MX record, because the _imap._tcp.server1.example.com would make the wildcard invalid for server1.example.com. Simply, wildcarding is not for case like this. -Message d'origine- De : bind-users De la part de Matus UHLAR - fantomas Envoyé : mardi 14 mai 2024 15:58 À : bind-users@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 I assume that _imap._tcp should be configurable per domain, so there should not be needed any need for things like _imap._tcp.server1.example.com - you should use _imap._tcp.example.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. correct. Is there an other way to simplify or does I have to add each entry individually? no, but the question is if you really need this. -- Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/ Warning: I wish NOT to receive e-mail advertising to this address. Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu. I'm not interested in your website anymore. If you need cookies, bake them yourself. -- Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
RE: SRV on multiple subdomains
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 De la part de Matus UHLAR - fantomas Envoyé : mardi 14 mai 2024 15:58 À : bind-users@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 I assume that _imap._tcp should be configurable per domain, so there should not be needed any need for things like _imap._tcp.server1.example.com - you should use _imap._tcp.example.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. correct. >Is there an other way to simplify or does I have to add each entry >individually? no, but the question is if you really need this. -- Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/ Warning: I wish NOT to receive e-mail advertising to this address. Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu. You have the right to remain silent. Anything you say will be misquoted, then used against you. -- Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users -- Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
Re: SRV on multiple subdomains
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. -- Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
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 I assume that _imap._tcp should be configurable per domain, so there should not be needed any need for things like _imap._tcp.server1.example.com - you should use _imap._tcp.example.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. correct. Is there an other way to simplify or does I have to add each entry individually? no, but the question is if you really need this. -- Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/ Warning: I wish NOT to receive e-mail advertising to this address. Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu. You have the right to remain silent. Anything you say will be misquoted, then used against you. -- Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
SRV on multiple subdomains
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 -- Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
