0-TTL when querying "invalid" soa
Tom
tomtux007 at gmail.com
Wed Jan 30 06:57:17 UTC 2019
Perfect.., many thanks for your hints.
Tom
On 29.01.19 16:33, Tony Finch wrote:
> Tom <tomtux007 at gmail.com> wrote:
>>
>> We're running BIND-9.12.3-P1 on our authoritative servers and we have the same
>> behavior with 0-ttl with a invalid soa-query. Is this bind-specific? Why does
>> an invalid soa-record responds with 0-ttl in the authority-section?
>
> Funnily enough, this little obscurity came up elsewhere just last week.
>
> I had the same question back in 2012:
>
> https://lists.isc.org/pipermail/bind-users/2012-June/087843.html
>
> https://tools.ietf.org/html/draft-andrews-dnsext-soa-discovery
>
> The latter link explains the reason for this odd behaviour.
>
> [ Last week we also discussed an odd bit of text in RFC 1035: "For
> example, SOA records are always distributed with a zero TTL to
> prohibit caching." But RFC 2181 said you must no longer do that. ]
>
> https://twitter.com/fanf/status/1087708537600569344
>
> Tony.
>
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