avahi-daemon.conf(5) File Formats Manual avahi-daemon.conf(5)
NAME
avahi-daemon.conf - avahi-daemon configuration file
SYNOPSIS
/etc/avahi/avahi-daemon.conf
DESCRIPTION
avahi-daemon.conf is the configuration file for avahi-daemon.
SECTION [SERVER]
host-name= Set the host name avahi-daemon tries to register on the LAN.
If omited defaults to the system host name as set with the sethostname()
system call.
host-name-from-machine-id= Takes a boolean value ("yes" or "no"). If set
to "yes" avahi-daemon will use the machine-id as name on the LAN.
domain-name= Set the default domain name avahi-daemon tries to register
its host name and services on the LAN in. If omitted defaults to ".lo-
cal".
browse-domains= Set a comma separated list of browsing domains (in addi-
tion to the default one and those announced inside the default browsing
domain). Please note that the user may specify additional browsing do-
mains on the client side, either by setting $AVAHI_BROWSE_DOMAINS to a
list of colon separated domains or by adding them to the XDG config file
~/.config/avahi/browse-domains (separated by newlines).
use-ipv4= Takes a boolean value ("yes" or "no"). If set to "no" avahi-
daemon will not use IPv4 sockets. Default is "yes".
use-ipv6= Takes a boolean value ("yes" or "no"). If set to "no" avahi-
daemon will not use IPv6 sockets. Default is "yes".
allow-interfaces= Set a comma separated list of allowed network inter-
faces that should be used by the avahi-daemon. Traffic on other inter-
faces will be ignored. If set to an empty list all local interfaces ex-
cept loopback and point-to-point will be used.
deny-interfaces= Set a comma separated list of network interfaces that
should be ignored by avahi-daemon. Other not specified interfaces will
be used, unless allow-interfaces= is set. This option takes precedence
over allow-interfaces=.
check-response-ttl= Takes a boolean value ("yes" or "no"). If set to
"yes", an additional security check is activated: incoming IP packets
will be ignored unless the IP TTL is 255. Earlier mDNS specifications
required this check. Since this feature may be incompatible with newer
implementations of mDNS it defaults to "no". On the other hand it pro-
vides extra security.
use-iff-running= Takes a boolean value ("yes" or "no"). If set to "yes"
avahi-daemon monitors the IFF_RUNNING flag bit which is used by some
(modern) network drivers to tell user space if a network cable is
plugged in (in case of copper ethernet), or the network card is associ-
ated with some kind of network (in case of WLAN). If IFF_RUNNING is set
avahi-daemon will automatically announce its services on that network.
Unfortunately far too many network drivers do not support this flag or
support it in a broken way. Therefore this option defaults to "no".
enable-dbus= Takes either "yes", "no" or "warn". If set to "yes" avahi-
daemon connects to D-Bus, offering an object oriented client API. It is
only available if Avahi has been compiled with --enable-dbus in which
case it defaults to "yes". "warn" behaves like "yes", but the daemon
starts up even when it fails to connect to a D-Bus daemon. In addition,
if the connection to the D-Bus daemon is terminated we try to reconnect.
(Unless we are in a chroot() environment where this definitely will
fail.)
disallow-other-stacks= Takes a boolean value ("yes" or "no"). If set to
"yes" no other process is allowed to bind to UDP port 5353. This effec-
tively impedes other mDNS stacks from running on the host. Use this as a
security measure to make sure that only Avahi is responsible for mDNS
traffic. Please note that we do not recommend running multiple mDNS
stacks on the same host simultaneously. This hampers reliability and is
a waste of resources. However, to not annoy people this option defaults
to "no".
allow-point-to-point= Takes a boolean value ("yes" or "no"). If set to
"yes" avahi-daemon will make use of interfaces with the POINTOPOINT flag
set. This option defaults to "no" as it might make mDNS unreliable due
to usually large latencies with such links and opens a potential secu-
rity hole by allowing mDNS access from Internet connections. Use with
care and YMMV!
cache-entries-max= Takes an unsigned integer specifying how many re-
source records are cached per interface. Bigger values allow mDNS work
correctly in large LANs but also increase memory consumption.
clients-max= Takes an unsigned integer. The maximum number of concurrent
D-Bus clients allowed. If the maximum number is reached further clients
will be refused until at least one existing client disconnects.
objects-per-client-max= Takes an unsigned integer. The maximum number of
objects (entry groups, browsers, resolvers) that may be registered per
D-Bus client at a time. If the maximum number is reached further object
creation will be refused until at least one object is freed.
entries-per-entry-group-max= Takes an unsigned integer. The maximum num-
ber of entries (resource records) per entry group registered by a D-Bus
client at a time. If the maximum number is reached further resource
records may not be added to an entry group.
ratelimit-interval-usec= Takes an unsigned integer. Sets the per-inter-
face packet rate-limiting interval parameter. Together with ratelimit-
burst= this may be used to control the maximum number of packets Avahi
will generated in a specific period of time on an interface.
ratelimit-burst= Takes an unsigned integer. Sets the per-interface
packet rate-limiting burst parameter. Together with ratelimit-interval-
usec= this may be used to control the maximum number of packets Avahi
will generated in a specific period of time on an interface.
SECTION [WIDE-AREA]
enable-wide-area= Takes a boolean value ("yes" or "no"). Enable wide-
area DNS-SD, aka DNS-SD over unicast DNS. If this is enabled only do-
mains ending in .local will be resolved on mDNS, all other domains are
resolved via unicast DNS. If you want to maintain multiple different
multicast DNS domains even with this option enabled we encourage you to
use subdomains of .local, such as "kitchen.local". This option defaults
to "yes".
SECTION [PUBLISH]
disable-publishing= Takes a boolean value ("yes" or "no"). If set to
"yes", no record will be published by Avahi, not even address records
for the local host. Avahi will be started in a querying-only mode. Use
this is a security measure. This option defaults to "no"
disable-user-service-publishing= Takes a boolean value ("yes" or "no").
If set to "yes", Avahi will still publish address records and suchlike
but will not allow user applications to publish services. Use this is a
security measure. This option defaults to "no"
add-service-cookie= Takes a boolean value ("yes" or "no"). If set to
"yes" an implicit TXT entry will be added to all locally registered ser-
vices, containing a cookie value which is chosen randomly on daemon
startup. This can be used to detect if two services on two different in-
terfaces/protocols are actually identical. Defaults to "no".
publish-addresses= Takes a boolean value ("yes" or "no"). If set to
"yes" avahi-daemon will register mDNS address records for all local IP
addresses. Unless you want to use avahi-daemon exclusively for browsing
it's recommended to enable this. If you plan to register local services
you need to enable this option. Defaults to "yes".
publish-hinfo= Takes a boolean value ("yes" or "no"). If set to "yes"
avahi-daemon will register an mDNS HINFO record on all interfaces which
contains information about the local operating system and CPU, which
might be useful for administrative purposes. This is recommended by the
mDNS specification but not required. For the sake of privacy you might
choose to disable this feature. Defaults to "no".
publish-workstation= Takes a boolean value ("yes" or "no"). If set to
"yes" avahi-daemon will register a service of type "_workstation._tcp"
on the local LAN. This might be useful for administrative purposes (i.e.
browse for all PCs on the LAN), but is not required or recommended by
any specification. Newer MacOS X releases register a service of this
type. Defaults to "no".
publish-domain= Takes a boolean value ("yes" or "no"). If set to "yes"
avahi-daemon will announce the locally used domain name (see above) for
browsing by other hosts. Defaults to "yes".
publish-dns-servers= Takes a comma separated list of IP addresses for
unicast DNS servers. You can use this to announce unicast DNS servers
via mDNS. When used in conjunction with avahi-dnsconfd on the client
side this allows DHCP-like configuration of unicast DNS servers.
publish-resolv-conf-dns-servers= Takes a boolean value ("yes" or "no").
If set to "yes" avahi-daemon will publish the unicast DNS servers speci-
fied in /etc/resolv.conf in addition to those specified with publish-
dns-servers. Send avahi-daemon a SIGHUP to have it reload this file. De-
faults to "no".
publish-aaaa-on-ipv4= Takes a boolean value ("yes" or "no"). If set to
"yes" avahi-daemon will publish an IPv6 AAAA record via IPv4, i.e. the
local IPv6 addresses can be resolved using an IPv4 transport. Only use-
ful when IPv4 is enabled with use-ipv4=true. Defaults to "yes".
publish-a-on-ipv6= Takes a boolean value ("yes" or "no"). If set to
"yes" avahi-daemon will publish an IPv4 A record via IPv6, i.e. the lo-
cal IPv4 addresses can be resolved using an IPv6 transport. Only useful
when IPv6 is enabled with use-ipv6=true. Defaults to "no".
SECTION [REFLECTOR]
enable-reflector= Takes a boolean value ("yes" or "no"). If set to "yes"
avahi-daemon will reflect incoming mDNS requests to all local network
interfaces, effectively allowing clients to browse mDNS/DNS-SD services
on all networks connected to the gateway. The gateway is somewhat intel-
ligent and should work with all kinds of mDNS traffic, though some func-
tionality is lost (specifically the unicast reply bit, which is used
rarely anyway). Make sure to not run multiple reflectors between the
same networks, this might cause them to play Ping Pong with mDNS pack-
ets. Defaults to "no".
reflect-ipv= Takes a boolean value ("yes" or "no"). If set to "yes" and
enable-reflector is enabled, avahi-daemon will forward mDNS traffic be-
tween IPv4 and IPv6, which is usually not recommended. Defaults to "no".
reflect-filters= Set a comma separated list of allowed service names to
be reflected. Each service that is seen must match an entry in this list
to be reflected to other networks. This list can match the type of ser-
vice or the name of the machine providing the service. Defaults to al-
lowing all services.
SECTION [RLIMITS]
This section is used to define system resource limits for the daemon.
See setrlimit(2) for more information. If any of the options is not
specified in the configuration file, avahi-daemon does not change it
from the system defaults.
rlimit-as= Value in bytes for RLIMIT_AS (maximum size of the process's
virtual memory). Sensible values are heavily system dependent.
rlimit-core= Value in bytes for RLIMIT_CORE (maximum core file size).
Unless you want to debug avahi-daemon, it is safe to set this to 0.
rlimit-data= Value in bytes for RLIMIT_DATA (maximum size of the
process's data segment). Sensible values are heavily system dependent.
rlimit-fsize= Value for RLIMIT_FSIZE (maximum size of files the process
may create). Since avahi-daemon shouldn't write any files to disk, it is
safe to set this to 0.
rlimit-nofile= Value for RLIMIT_NOFILE (open file descriptors). avahi-
daemon shouldn't need more than 15 to 20 open file descriptors concur-
rently.
rlimit-stack= Value in bytes for RLIMIT_STACK (maximum size of the
process stack). Sensible values are heavily system dependent.
rlimit-nproc= Value for RLIMIT_NPROC (max number of processes a user can
launch). avahi-daemon forks of a helper process on systems where ch-
root(2) is available therefore this value should not be set below 2.
Note that while the process limit only applies to this process, the to-
tal count of processes to reach that limit includes all processes on the
system with the same UID, including any containers without UID remapping
(such as lxd containers with security.privileged=true). The default con-
figuration of 3 was removed to prevent problems in this scenario.
AUTHORS
The Avahi Developers <avahi (at) lists (dot) freedesktop (dot) org>;
Avahi is available from http://avahi.org/
SEE ALSO
avahi-daemon(8), avahi-dnsconfd(8)
COMMENTS
This man page was written using xml2man(1) by Oliver Kurth.
Manuals User avahi-daemon.conf(5)
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