>> Edit the corresponding REVERSE zone & add following line in the end >> >> $GENERATE 1-255 $ IN PTR 10-11-11-$.example.com. >> >> Dont forget to Reload bind config & you are done. > > Thanks. > How is the syntax for IPv6? > Is it possible to do it for an entire /64?
The full syntax of the $GENERATE zone file directive as implemented by BIND can be found at https://bind9.readthedocs.io/en/latest/chapter3.html#bind-primary-file-extension-the-generate-directive Apparently, you can generate entries for 0-f with $GENERATE 0-15 ${0,0,x}0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.e.d.0.c.d.a.b.0.1.0.0.2.ip6.arpa. IN PTR $.whatevername.your-domain-sequence. However, a couple of points: 1) I don't think you can "nest" $GENERATE directives, so the above only enters 16 PTR records in the DNS, and you probably need to enter "umpteen" such $GENERATE entries if you want to insist on unique names in the zone file. 2) Think about what you are trying to do here... To "fill" an in-addr.arpa zone for a /24 you require 256 records, and that's eminently feasible. To "fill" an ip6.arpa zone for a /64 requires 18446744073709551616 records (yes, that's about 18 x 10^18 if my math isn't off). I predict you do not posess a machine capable of running BIND with that many records loaded -- I know we don't. The $GENERATE directive actually creates all the individual records you ask it to do before the zone is loaded "properly" -- think of it as a "macro expansion" for the zone file, and that the zone file is "pre-processed" before it's loaded. The reasons above are probably the reason that ISPs either can be tempted to do ip6.arpa for "anonymous clients" with wildcard records if they do anything about it at all. Either that, or they generate the zone file from other "external" provisioning data. The approach of using wildcard records can from a technological perspective be combined with "custom" entries in the same zone -- remember that wildcard records only match if the queried-for name otherwise doesn't exist in the zone file. Regards, - Håvard -- 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
