howto: keep serving from cache after TTL if servers down ?

[Sean Darcy]

Thanks for the prompt reply. Exactly what I needed.

Thanks,
sean
On Fri, Nov 23, 2018 at 11:02 AM Wouter Wijngaards via Unbound-users
<unbound-users at nlnetlabs.nl> wrote:
>
> Hi Sean,
>
> On 23/11/2018 16:56, Sean Darcy via Unbound-users wrote:
> > I'm running a voip application, asterisk, that dies if it can't
> > resolve the addresses for its SIP registrations. Importantly there are
> > other connections, PSTN, that work even if the internet connection is
> > down. Also, I want the app to stay alive so that it can reconnect to
> > the SIP servers once the internet comes back up. For whatever reason,
> > asterisk itself will not have a fix for this.
> >
> > I have unbound working on the machine. I'd like to have unbound serve
> > an address from its cache even if it's beyond the ttl IF it can't
> > refresh the address. In other words, just serve the stale address
> > until it can be refreshed.
> >
> > Any way to do this ?
>
>
> serve-expired: yes in unbound.conf serves stale data.
>
> It is good to also enable prefetch: yes.  Then unbound tries to refresh
> data that is about to expire, whilst serving the existing data.
>
> You can fine-tune it with the serve-expired-ttl and
> serve-expired-ttl-reset options if you want.  But you can just leave
> those at the defaults.
>
>
> Best regards, Wouter
>
>
> >
> > sean