Maintained by: NLnet Labs

[Unbound-users] No failover in stub-zone?

W.C.A. Wijngaards
Tue Jul 10 09:34:36 CEST 2012


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Hi Andreas,

On 07/09/2012 10:52 PM, lst_hoe02 at kwsoft.de wrote:
> Hello
> 
> we have on our border dns recursor (unbound 1.4.17) some
> stub-zones mostly for PTR lookups for our internal AS112 addresses
> like this:
> 
> stub-zone: name: "10.in-addr.arpa" stub-addr:
> <IP-first-internal-NS> stub-addr: <IP-second-internal-NS>

unbound will divide the load amongst the addresses.
It will randomise with RTT banding.

> Today the first internal NS went down and most reverse lookups slow
> to crawl. I expexted unbound would notice the failure and simply
> only use the second after some time like it did with normal lookups
> when skipping unavailable NS.
> 
> Is this expected behaviour or have i done something wrong?

The second server also fails?

Unbound should try both servers (randomly if they are working, for 50%
load on both of them).

Best regards,
   Wouter
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