The SRV and TXT records usage is depending on underscore not being part of a hostname. The separator in hostname labels is dash. e.g. my-host.example.net
_ssh._tcp.example.net SRV can be safely deployed because there are no legal hostnames starting with _ssh and _tcp. Hostname (and mail domain) syntax is defined by RFC 952 as modified by RFC1123 (allows labels to start with digits. PTR records it depends on usage. Mark > On 17 Feb 2021, at 19:13, ONRUBIA AVILES Carlos (CCS/MST) > <carlos.onrubia.avi...@proximus.com> wrote: > > Hello , > > I face the following problem è bind do not accept an A record with > underscore: > > Example: example_try A 1.2.3.4 > > > Same for a PTR: > > Example: 1.2.3.4 PTR example_try > > > Is it absolutely forbidden to have in such cases an ‘_’? > I know that it is possible for SRV or TXT records. > > > Thanks in advance to clarify the situation and sorry if this question has > already be asked. > > Carlos, > > > Sensitivity: Internal Use Only > This e-mail cannot be used for other purposes than Proximus business use. See > more on https://www.proximus.be/maildisclaimer > _______________________________________________ > Please 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 -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ Please 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
