On Wed, 2014-09-10 at 18:13 -0400, Kevin Darcy wrote: > No, what I'm saying is that if > > example.com owns an A record 203.0.113.48, and > www.example.com owns an A record 203.0.113.48, then > > where does 48.113.0.203.in-addr.arpa point? > > Some people will point it at example.com, some will point it at > www.example.com. What you get is a mish-mosh. No consistency.
Although I prefer the use of a CNAME solution (CNAME www.example.com to example.com), in the case of separate A (and AAAA) records, one could point the reverse to both names. Nothing wrong with a PTR record having more than one answer. There is then no inconsistency, just choice. After all, pretty much every NS record has at least two Right-Hand-Sides (Answers).... > If, on the other hand, www.example.com is a CNAME to example.com, then > it's crystal clear where the reverse record will point -- example.com. > There is no ambiguity or option for inconsistency. > > - Kevin > > On 9/10/2014 5:48 PM, Eliezer Croitoru wrote: > > Hey Kevin, > > > > This is not an issue at all. > > A PTR is different then a "A" record and can be used by two reverse > > domain names and only the owner of the IP addresses space can define > > them. > > I am not sure if two PTR records for two domains will be applied to > > one IP but it is possible for two IP addresses to have the same PTR. > > > > Can we even use a CNAME as a PTR??? > > > > Eliezer > > > > On 09/11/2014 12:37 AM, Kevin Darcy wrote: > >> Also, have you considered the forward/reverse ambiguity that arises when > >> multiple owner names resolve to the same address? To which of those > >> names does the PTR point? > >> > >> - Kevin > > > > _______________________________________________ > > Please visit https://lists.isc.org/mailman/listinfo/bind-users to > > unsubscribe from this list > > > > 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 > > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users -- Mark James ELKINS - Posix Systems - (South) Africa m...@posix.co.za Tel: +27.128070590 Cell: +27.826010496 For fast, reliable, low cost Internet in ZA: https://ftth.posix.co.za
smime.p7s
Description: S/MIME cryptographic signature
_______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
