BIND9 Feature Request: 'fowarders' priority & round-robin pools

[Darcy Kevin (FCA)]

Forwarders are selected based on an RTT(round-trip-time)-based algorithm, so none of this configuration complexity should be necessary from a performance/availability standpoint. The algorithm will choose faster forwarders over slower ones, and penalization/eventual-redemption of failed/non-responding forwarders is built into the algorithm. It's similar to the NS-selection algorithm; in fact, it might be a common server-selection routine that handles both situations.

Have you considered the option of not forwarding *at*all*? If your BIND instances have direct access to the Internet DNS, then forwarding isn't usually a good choice anyway. As a side benefit, talking directly to the authoritative nameservers should allay the privacy concerns associated with talking through a third party.

										- Kevin

-----Original Message-----
From: bind-users-bounces at lists.isc.org [mailto:bind-users-bounces at lists.isc.org] On Behalf Of nrgd at eml.cc
Sent: Monday, August 24, 2015 1:49 PM
To: bind-users at lists.isc.org
Subject: BIND9 Feature Request: 'fowarders' priority & round-robin pools

I run bind 9.10.2-P3.

I have three classes of forwarders that I'd like to use:

(1) my own, hosted forwarder.  fast & private, but not redundant infrastructure
(2) private/encrypted hosted forwarders.  slow, private, and redundant infrastructure.
(3) reliable ISP & public forwarders. fast, redundant, privacy-challenged (Google, OpenDNS, AT&T, etc).

Reading the Arm & chatting in #irc IIUC 'forwarders' are NOT queried in order listed, and there's no option to set priority, failover, round-robin etc.

I'm requesting such a feature.

For example, 

Forwaders would be queried in order of priority, and pools of multiple forwarders would be round-robin weighted within a given priority level.

So in conf, we could have

	forward only;
	forwarders { 11.11.11.11 port 11111 prio 1; 22.22.22.1 port 53 prio 2; 22.22.22.2 port 53 prio 2; 8.8.8.8 prio 3; 8.8.4.4 prio 3; };

Thanks!
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