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authorLennart Poettering <lennart@poettering.net>2015-08-26 10:30:06 +0200
committerLennart Poettering <lennart@poettering.net>2015-08-26 10:30:06 +0200
commit2dc6b11d29ae09f59de314bad24ad196b0d14277 (patch)
tree267014afa4a56410ac2cf51a90f13bc5ef317aca /man
parentda1d9fc2cc3bf6f89c037e11a584d444d0c3a2a8 (diff)
man: document resolved's RR synthesizing and query routing
Diffstat (limited to 'man')
-rw-r--r--man/systemd-resolved.service.xml57
1 files changed, 56 insertions, 1 deletions
diff --git a/man/systemd-resolved.service.xml b/man/systemd-resolved.service.xml
index 89ec5f8b19..27662456ea 100644
--- a/man/systemd-resolved.service.xml
+++ b/man/systemd-resolved.service.xml
@@ -1,4 +1,4 @@
-<?xml version='1.0'?> <!--*-nxml-*-->
+<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
@@ -71,6 +71,61 @@
<citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for more details.</para>
+ <para><command>systemd-resolved</command> synthesizes DNS RRs for the following cases:</para>
+
+ <itemizedlist>
+ <listitem><para>The local, configured hostname is resolved to
+ all locally configured IP addresses ordered by their scope, or
+ — if none are configured — the IPv4 address 127.0.0.2 (which
+ is on the local loopback) and the IPv6 address ::1 (which is the
+ local host).</para></listitem>
+
+ <listitem><para>The hostname <literal>localhost</literal> is
+ resolved to the IP addresses 127.0.0.1 and
+ ::1.</para></listitem>
+
+ <listitem><para>The hostname <literal>gateway</literal> is
+ resolved to all current default routing gateway addresses,
+ ordered by their metric. This assigns a stable hostname to the
+ current gateway, useful for referencing it independently of the
+ current network configuration state.</para></listitem>
+ </itemizedlist>
+
+ <para>Lookup requests are routed to the available DNS servers
+ and LLMNR interfaces according to the following rules:</para>
+
+ <itemizedlist>
+ <listitem><para>Lookups for the special hostname
+ <literal>localhost</literal> are never routed to the
+ network.</para></listitem>
+
+ <listitem><para>Single-label names are routed to all local
+ interfaces capable of IP multicasting, using the LLMNR
+ protocol. Lookups for IPv4 addresses are only sent via LLMNR on
+ IPv4, and lookups for IPv6 addresses are only sent via LLMNR on
+ IPv6. Lookups for the locally configured host name and the
+ <literal>gateway</literal> host name are never routed to
+ LLMNR.</para></listitem>
+
+ <listitem><para>Multi-label names are routed to all local
+ interfaces that have a DNS sever configured, plus the globally
+ configured DNS server if there is one. Address lookups from the
+ link-local addres range are never routed to
+ DNS.</para></listitem>
+ </itemizedlist>
+
+ <para>If lookups are routed to multiple interfaces, the first
+ successful response is returned (thus effectively merging the
+ lookup zones on all matching interfaces). If the lookup failed on
+ all interfaces the last failing response is returned.</para>
+
+ <para>Routing of lookups may be influenced by configuring
+ per-interface domain names, see
+ <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for details. Lookups for a hostname ending in one of the
+ per-interface domains are exclusively routed to the matching
+ interfaces.</para>
+
<para>Note that
<filename>/run/systemd/resolve/resolv.conf</filename> should not
be used directly, but only through a symlink from