On Tue, Sep 19, 2023 at 11:00:34PM +0100, Joe Abley wrote: > Apart from mail and some degree of debugging courtesy, what > operational reasons exist to put effort into reverse DNS in 2023? Are > there any? Or is the whole reverse tree just a weird anachronism?
Perhaps "apart from mail", it largely is. Often unhelpful, and sometimes trending on harmful (e.g. I've recently seen a few hundred PTR records for a single address in an over 32kB DNS response). The email ecosystem would benefit if a lot *fewer* addresses had PTR records, ideally just those of MTAs. With at least all the consumer dynamic pool nodes unlisted, unless the customer has or obtains a static IP and specifically requests a reverse mapping. Reverse IPs for routers do make debugging easier, not only for strangers, but also I would guess for the operators of said routers. So PTR RRs in support of traceroute are also helpful, and are don't get in the way of distinguishing MTAs from botnets. -- Viktor. _______________________________________________ dns-operations mailing list dns-operations@lists.dns-oarc.net https://lists.dns-oarc.net/mailman/listinfo/dns-operations