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Since following a delegation resets most fetch context state, address marks (FCTX_ADDRINFO_MARK) set inside lib/dns/resolver.c are not preserved when a delegation is followed. This is fine for full recursive resolution but when named is configured with "forward first;" and one of the specified forwarders times out, triggering a fallback to full recursive resolution, that forwarder should no longer be consulted at each delegation point subsequently reached within a given fetch context. Add a new badnstype_t enum value, badns_forwarder, and use it to mark a forwarder as bad when it times out in a "forward first;" configuration. Since the bad server list is not cleaned when a fetch context follows a delegation, this prevents a forwarder from being queried again after falling back to full recursive resolution. Yet, as each fetch context maintains its own list of bad servers, this change does not cause a forwarder timeout to prevent that forwarder from being used by other fetch contexts.
31 lines
830 B
Text
31 lines
830 B
Text
; Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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;
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; This Source Code Form is subject to the terms of the Mozilla Public
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; License, v. 2.0. If a copy of the MPL was not distributed with this
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; file, You can obtain one at http://mozilla.org/MPL/2.0/.
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;
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; See the COPYRIGHT file distributed with this work for additional
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; information regarding copyright ownership.
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$TTL 300
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. IN SOA gson.nominum.com. a.root.servers.nil. (
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2000042100 ; serial
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600 ; refresh
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600 ; retry
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1200 ; expire
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600 ; minimum
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)
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. NS a.root-servers.nil.
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a.root-servers.nil. A 10.53.0.1
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example1 NS ns.example1
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ns.example1 A 10.53.0.1
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example2 NS ns.example2
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ns.example2 A 10.53.0.1
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example3 NS ns.example3
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ns.example3 A 10.53.0.1
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example7 NS ns.example7
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ns.example7 A 10.53.0.2
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