Records "not" too long fails with "ran out of space"

[Ondřej Surý]

First of all, it’s harder to help you if you don’t share the real domains, but let’s suppose at least the rpz.local is real.

The maximum length is **255** including the label length for each label. I have no idea where you got 256. Each label have maximum length of 63 bytes (not 63-64).

Now, your 243 is actually 244 (first label also have to have length) + 4 (rpz) + 6 (local) + 1 (root) is exactly 255.

Ondrej
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Ondřej Surý — ISC (He/Him)

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> On 27. 12. 2022, at 16:50, Jesus Cea <jcea at jcea.es> wrote:
> 
> Configuring my RPZ installation, the zone fails to load because some register are "too long". The error in the logs is something like:
> 
> """
> dns_master_load: ../primarios/db.rpz.local:137146: ran out of space
> """
> 
> I did some tests and the zone load fails if records are longer than 243 characters. According to RFCs, I understand that it should work for records up to 256 characters, with a maximum of 63-64 characters per label.
> 
> As I said, my zone fails to load if any domain in the RPZ is bigger than 243 characters. Currently, my RPZ zone structure is something like:
> 
> """
> ZZZZZ.YYYY.XXXXX.com CNAME .
> """
> 
> This is bind 9.16.
> 
> I needed to delete some "long" records and I wonder why is my bind rejecting them.
> 
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