Question about how forwarders work

Matus UHLAR - fantomas uhlar at
Thu Dec 11 16:38:44 UTC 2014

On 11.12.14 16:28, Richard Thomas wrote:
>Please could I have some advice about how the below example configuration would work:
>forwarders { A.B.C.D; E.F.G.H; };
>What I wanted to achieve is that one of the IP addresses to be used as a
> primary DNS server and the other IP address to be used as a secondary DNS
> server.

BIND measures RTT for servers and uses the one that answes faster.
It ocasionally re-tries slower server, if the situation did not change.
That should result to fastest resolution. This should be the best for you.

Many people recommend doing recursion directly instead of using forwarders.
Especially for mail servers with anti-spam measures, where your forwarders
may be ignored by some blacklists, because they send too much queries.

Matus UHLAR - fantomas, uhlar at ;
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