automatic reverse and forwarding zones

[Matus UHLAR - fantomas]

>>>>On 28.10.22 08:26, Ondřej Surý wrote:
>>>>>BIND 9 have support for writing plugins, and we would accept a 
>>>>>well written plugin that would allow generating the forward/reverse plugins on the fly.
>>>>>
>>>>>There’s already a feature request for it here: 
>>>>>https://gitlab.isc.org/isc-projects/bind9/-/issues/1586
>>
>>>On 28. 10. 22 9:29, Matus UHLAR - fantomas wrote:
>>>>this request for ipv4 too.
>>>>
>>>>I really don't think making generic named for ipv6 addresses 
>>>>within range 
>>>>bigger then e.g. /112 (64Ki addresses) makes any sense.
>>>>
>>>>prehaps it may for small subsets of IP addresses
>>>>
>>>>/64 is 18446744073709551616 addresses, that can't be scanned in 
>>>>meaningful time and this number of DNS records would just mess 
>>>>up any DNS servers' memory.
>>>>
>>>>making BIND resilient against overflowing memory this way would 
>>>>make more sense than creating generic addresses.
>>
>>On 07.11.22 15:06, Petr Špaček wrote:
>>>Yes, that's exactly why plugin is needed. The plugin can generate 
>>>answers on the fly without having all of them in memory.

>On 07. 11. 22 15:23, Matus UHLAR - fantomas wrote:
>>what about BIND receiving those records?
>>I don't want my resolving DNS server to fill out cache by reverse 
>>records of any remote ipv6 range/ranges.
>>
>>We'd need to clean those too.

On 07.11.22 15:42, Petr Špaček wrote:
>That's part of normal resolver operation: Garbage in - garbage out - 
>garbage eventually cleaned out from cache. There is nothing special 
>about PTR records in that regard.

sooner or later, but filling up cache with garbage could result in other 
non-garbage records being flushed out. 

Are there any mechanisms that would wipe this garbage before other records, 
used more often even if not very recently?

-- 
Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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