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b42681c4e9
Replace the hard-coded paths for various BIND 9 files (configuration, pid, etc.) in the man pages and ARM with compile-time values using the sphinx-build replace system. This is more complicated, because the restructured text specification doesn't allow |substitions| inside ``code-blocks``, so for each specific file we had to create own substition which is sub-optimal, but it is only way how to do this without adding Sphinx extension.
89 lines
3.1 KiB
ReStructuredText
89 lines
3.1 KiB
ReStructuredText
.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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..
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.. SPDX-License-Identifier: MPL-2.0
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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 https://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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.. highlight: console
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.. _man_filter-aaaa:
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filter-aaaa.so - filter AAAA in DNS responses when A is present
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---------------------------------------------------------------
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Synopsis
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~~~~~~~~
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:program:`plugin query` "filter-aaaa.so" [{ parameters }];
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Description
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~~~~~~~~~~~
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``filter-aaaa.so`` is a query plugin module for ``named``, enabling
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``named`` to omit some IPv6 addresses when responding to clients.
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Until BIND 9.12, this feature was implemented natively in ``named`` and
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enabled with the ``filter-aaaa`` ACL and the ``filter-aaaa-on-v4`` and
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``filter-aaaa-on-v6`` options. These options are now deprecated in
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``named.conf`` but can be passed as parameters to the
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``filter-aaaa.so`` plugin, for example:
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::
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plugin query "filter-aaaa.so" {
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filter-aaaa-on-v4 yes;
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filter-aaaa-on-v6 yes;
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filter-aaaa { 192.0.2.1; 2001:db8:2::1; };
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};
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This module is intended to aid transition from IPv4 to IPv6 by
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withholding IPv6 addresses from DNS clients which are not connected to
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the IPv6 Internet, when the name being looked up has an IPv4 address
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available. Use of this module is not recommended unless absolutely
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necessary.
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Note: This mechanism can erroneously cause other servers not to give
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AAAA records to their clients. If a recursing server with both IPv6 and
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IPv4 network connections queries an authoritative server using this
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mechanism via IPv4, it is denied AAAA records even if its client is
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using IPv6.
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Options
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~~~~~~~
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``filter-aaaa``
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This option specifies a list of client addresses for which AAAA filtering is to
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be applied. The default is ``any``.
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``filter-aaaa-on-v4``
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If set to ``yes``, this option indicates that the DNS client is at an IPv4 address, in
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``filter-aaaa``. If the response does not include DNSSEC
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signatures, then all AAAA records are deleted from the response. This
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filtering applies to all responses, not only authoritative
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ones.
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If set to ``break-dnssec``, then AAAA records are deleted even when
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DNSSEC is enabled. As suggested by the name, this causes the response
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to fail to verify, because the DNSSEC protocol is designed to detect
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deletions.
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This mechanism can erroneously cause other servers not to give AAAA
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records to their clients. If a recursing server with both IPv6 and IPv4
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network connections queries an authoritative server using this
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mechanism via IPv4, it is denied AAAA records even if its client is
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using IPv6.
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``filter-aaaa-on-v6``
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This option is identical to ``filter-aaaa-on-v4``, except that it filters AAAA responses
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to queries from IPv6 clients instead of IPv4 clients. To filter all
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responses, set both options to ``yes``.
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See Also
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~~~~~~~~
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BIND 9 Administrator Reference Manual.
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