forwarders used in order or based on RTT ?
warren at kumari.net
Mon Oct 19 15:37:58 UTC 2020
On Mon, Oct 19, 2020 at 11:26 AM Victoria Risk <vicky at isc.org> wrote:
> The ARM was updated in 9.16.6. Sorry it took us so long!
> from https://gitlab.isc.org/isc-projects/bind9/-/issues/2030
> Forwarders are typically used when an administrator does not wish for
> all the servers at a given site to interact directly with the rest of
> the Internet. For example, a common scenario is when multiple internal
> DNS servers are behind an Internet firewall. Servers behind the firewall
> forward their requests to the server with external access, which queries
> Internet DNS servers on the internal servers' behalf.
> Another scenario (largely now superseded by Response Policy Zones) is to
> send queries first to a custom server for RBL processing before
> forwarding them to the wider Internet.
> There may be one or more forwarders in a given setup. The order in which
> the forwarders are listed in ``named.conf`` does not determine the
> sequence in which they are queried; rather, ``named`` uses the response
> times from previous queries to select the server that is likely to
> respond the most quickly. A server that has not yet been queried is
> given an initial small random response time to ensure that it is tried
> at least once. Dynamic adjustment of the recorded response times ensures
> that all forwarders are queried, even those with slower response times.
> This permits changes in behavior based on server responsiveness.
Awesome, thank you -- that's clean and easy to understand.
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I don't think the execution is relevant when it was obviously a bad
idea in the first place.
This is like putting rabid weasels in your pants, and later expressing
regret at having chosen those particular rabid weasels and that pair
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