Re: Case sensitivity of RDATA in PTR records
Mark Andrews <[email protected]>
| Newsgroups | gmane.ietf.dnsext |
|---|---|
| Message-ID | <[email protected]> |
In message <[email protected]>, "Hosnieh Rafiee" writes: > > > > In message > > <[email protected] > > acific.corp.microsoft.com>, Vi thalprasad Gaitonde writes: > > > Thanks Mark for the clarification > > > > > > Is DNS server expected to preserve case of the domain name in PTR RDATA. > > > > Yes. > > I guess so if you are talking about the Linux system which is case > sensitive. But I don't think this can happen in windows DNS servers. I don't > have experience with the latest versions, but in the older versions it > wasn't like this. > > Hosnieh We are talking about what nameservers should do. Yes there are broken implementations out there. Named isn't perfect in this respect as it doesn't correctly preserve the case of owner names of records when adding them to the internal databases. Keeping a bit vector of the case of each octet in the ownername with each record would be one way to address this without consuming too much memory. We don't currently do case preserving compression when responding to general queries. For PTR queries in the reverse tree this is usually not a issue but for other queries it could be. We do preserve case of rdata in ixfr and axfr transfers. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: [email protected] _______________________________________________ dnsext mailing list [email protected] https://www.ietf.org/mailman/listinfo/dnsext