Hello,
cachs syncing is not something we have and even with it (or using a
single resolver) there is an issue that records can change:
the scenario:
- a client asks the record, record gets cached
- client A asks and gets cached value,
- publisher of records changes the record
- record expires from cache
- client B (firewall) asks and record resolves to different value.
On Sat, Sep 17, 2022 at 01:01:09AM +0100, Djerk Geurts via Pdns-users wrote:
> Just ran into an issue with recursive DNS servers where the two servers have
> cached a different A record for mirror.centos.org.
>
> This is a problem as the firewalls permit access to the FQDN, which presumes
> that both the client and the firewall end up with the same A record for the
> domain.
>
> I'm intending to swap these recursors out with PowerDNS servers, but am
> wondering if there's a way to keep the record cache in sync between multiple
> recursors.
>
> --
> Best regards,
> Djerk Geurts
> m: +44-7535-674620
>
> Maizymoo Ltd
> VAT No: GB192 1529 07
> Registration Number: 6638104 (registered in England and Wales)
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