IRC for example will check for PTR and gate login. I know there are others but that came to mind quickly. In some regions having PTRs was a requirement. It has been years but I recall LACNIC required/desired PTRs be set.
On Thu, Oct 27, 2022 at 2:47 PM Grant Taylor via bind-users < bind-users@lists.isc.org> wrote: > On 10/27/22 1:24 PM, Marco wrote: > > At least for IPv4, there are servers that reject connections from > > IPs that don't have a reverse zone with PTR record. > > Please elaborate. > > I've not heard of (unspecified type of) servers rejecting connections > because of the lack of a PTR record. > > I have heard of mail servers /accepting/ a /TCP/ /transport/ connection > layer but /rejecting/ email at the /SMTP/ /application/ layer for the > lack of a PTR record. > > IMHO mail servers are not in scope for a $GENERATE style flood filling > of a zone. Rather they are in scope for very specifically generated > AAAA records. > > > That is the only reason that I see for that. > > Most ISPs do it. > > I'd say that /many/ ISPs populate in-addr.arpa zone(s) for IPv4. -- I > still run across IPv4 addresses that don't have PTR records way more > often than I think is reasonable. > > I've seen no evidence that ISPs also populate ip6.arpa zone(s) for IPv6 > in a similar way. Not the least of which are some of the reasons called > out in this thread. > > > > -- > Grant. . . . > unix || die > > -- > 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 > -- - Andrew "lathama" Latham -
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