No. The PTR records that map from IP address to hostname enforce the hostname rules.
-- Mark Andrews > On 18 Feb 2021, at 02:20, Sten Carlsen <st...@s-carlsen.dk> wrote: > > > >> On 17 Feb 2021, at 12.34, ONRUBIA AVILES Carlos (CCS/MST) >> <carlos.onrubia.avi...@proximus.com> wrote: >> >> Hello, >> >> Indeed my question was on A record but the issue is on PTR record. >> I can configure the following line: >> >> _ptr.dekil.nl. 3600 IN PTR >> _81.99-129-109.adsl-dyn.isp.dekil.nl >> >> It works....we can use "_" in both sides. >> >> >> But what is strange is that the following configuration do not work: >> >> 9.10.238.195.in-addr.arpa. 3600 IN PTR >> por_tal-bis.skynet.be. >> >> "_" is not allowed >> >> Is it due to extra check by bind when it sees it is an arpa zone so no "_" >> is allowed? > > As previously mentioned, the RFCs expressly forbids the "_" in names. > > I assume that a leading "_" slips past Bind's control because it "could" be > part of a valid but at compile time unknown _tcp -like label. > >> >> >> Regards, >> >> Carlos, >> >> >> Sensitivity: Internal Use Only >> >> -----Original Message----- >> From: Ondřej Surý <ond...@isc.org> >> Sent: 17 February 2021 10:52 >> To: ONRUBIA AVILES Carlos (CCS/MST) <carlos.onrubia.avi...@proximus.com> >> Cc: Mark Andrews <ma...@isc.org>; bind-users@lists.isc.org >> Subject: Re: underscore in A or PTR records >> >>> >>>> On 17. 2. 2021, at 9:50, ONRUBIA AVILES Carlos (CCS/MST) >>>> <carlos.onrubia.avi...@proximus.com> wrote: >>> >>> The issue we face is that a telecom provider ask us to implement a PTR >>> record with a name like “example_try.net" >> >> You are mixing the two things here. If the provider has asked you to create >> a PTR record, why do you keep trying to create a forward record? There’s >> some information missing somewhere. >> >> Ondrej >> -- >> Ondřej Surý (He/Him) >> ond...@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 > > _______________________________________________ > 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 _______________________________________________ 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
