Hello, Thanks for these clarifications. The issue we face is that a telecom provider ask us to implement a PTR record with a name like "example_try.net" We tried this configuration but BIND do not accept it. The telecom provider complaints we can not make this DNS configuration and that it must be possible (for the moment they do not gave us examples to prove what they say).
So to be clear can we answer to this telecom provider that using a PTR with "_" is not possible and not RFC compliant? Or is there anything I miss? Thanks in advance for your time. Carlos, Sensitivity: Internal Use Only -----Original Message----- From: Mark Andrews <ma...@isc.org> Sent: 17 February 2021 09:28 To: ONRUBIA AVILES Carlos (CCS/MST) <carlos.onrubia.avi...@proximus.com> Cc: bind-users@lists.isc.org Subject: Re: underscore in A or PTR records 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://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Flist > s.isc.org%2Fmailman%2Flistinfo%2Fbind-users&data=04%7C01%7Ccarlos. > onrubia.aviles%40proximus.com%7Cdf9e40bb2739424445be08d8d31de6af%7Ce7a > b81b21e844bf79dcbb6fec01ed138%7C0%7C0%7C637491472662614546%7CUnknown%7 > CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXV > CI6Mn0%3D%7C1000&sdata=o3VYr2m93TRf7ODAq8NPV3M5dd4EvXR9uZ8wdi3C1X8 > %3D&reserved=0 to unsubscribe from this list > > ISC funds the development of this software with paid support subscriptions. > Contact us at > https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.isc.org%2Fcontact%2F&data=04%7C01%7Ccarlos.onrubia.aviles%40proximus.com%7Cdf9e40bb2739424445be08d8d31de6af%7Ce7ab81b21e844bf79dcbb6fec01ed138%7C0%7C0%7C637491472662614546%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=SiZULEaSrJIfUUxXhwwLP%2Fa2Yg3w2pJuJcivH2Wadtk%3D&reserved=0 > for more information. > > > bind-users mailing list > bind-users@lists.isc.org > https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Flist > s.isc.org%2Fmailman%2Flistinfo%2Fbind-users&data=04%7C01%7Ccarlos. > onrubia.aviles%40proximus.com%7Cdf9e40bb2739424445be08d8d31de6af%7Ce7a > b81b21e844bf79dcbb6fec01ed138%7C0%7C0%7C637491472662614546%7CUnknown%7 > CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXV > CI6Mn0%3D%7C1000&sdata=o3VYr2m93TRf7ODAq8NPV3M5dd4EvXR9uZ8wdi3C1X8 > %3D&reserved=0 -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org 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
