firewalld.conf
Name
firewalld.conf — firewalld configuration file
Synopsis
/etc/firewalld/firewalld.conf
Description
firewalld.conf is loaded by firewalld during the initialization process. The file contains the basic configuration options for firewalld.
Options
These are the options that can be set in the config file:
DefaultZoneThis sets the default zone for connections or interfaces if the zone is not selected or specified by NetworkManager, initscripts or command line tool. The default zone is public.
MinimalMarkDeprecated. This option is ignored and no longer used. Marks are no longer used internally.
CleanupModulesOnExitSetting this option to yes or true unloads all firewall-related kernel modules when firewalld is stopped. The default value is no or false.
CleanupOnExitIf firewalld stops, it cleans up all firewall rules. Setting this option to no or false leaves the current firewall rules untouched. The default value is yes or true.
LockdownIf this option is enabled, firewall changes with the D-Bus interface will be limited to applications that are listed in the lockdown whitelist (see firewalld.lockdown-whitelist(5)). The default value is no or false.
IPv6_rpfilterIf this option is enabled (it is by default), reverse path filter test on a packet for IPv6 is performed. If a reply to the packet would be sent via the same interface that the packet arrived on, the packet will match and be accepted, otherwise dropped. For IPv4 the rp_filter is controlled using sysctl.
Note: This feature has a performance impact. In most cases the impact is not enough to cause a noticeable difference. It requires route lookups and its execution occurs before the established connections fast path. As such it can have a significant performance impact if there is a lot of traffic. It's enabled by default for security, but can be disabled if performance is a concern.
IndividualCallsIf this option is disabled (it is by default), combined -restore calls are used and not individual calls to apply changes to the firewall. The use of individual calls increases the time that is needed to apply changes and to start the daemon, but is good for debugging as error messages are more specific.
LogDeniedAdd logging rules right before reject and drop rules in the INPUT, FORWARD and OUTPUT chains for the default rules and also final reject and drop rules in zones for the configured link-layer packet type. The possible values are:
all,unicast,broadcast,multicastandoff. The default setting isoff, which disables the logging.AutomaticHelpersDeprecated. This option is ignored and no longer used.
FirewallBackendSelects the firewall backend implementation. Possible values are;
nftables(default), oriptables. This applies to all firewalld primitives. The only exception is direct and passthrough rules which always use the traditional iptables, ip6tables, and ebtables backends.Note: The iptables backend is deprecated. It will be removed in a future release.
FlushAllOnReloadFlush all runtime rules on a reload. In previous releases some runtime configuration was retained during a reload, namely; interface to zone assignment, and direct rules. This was confusing to users. To get the old behavior set this to "no". Defaults to "yes".
RFC3964_IPv4As per RFC 3964, filter IPv6 traffic with 6to4 destination addresses that correspond to IPv4 addresses that should not be routed over the public internet. Defaults to "yes".
AllowZoneDriftingDeprecated. This option is ignored and no longer used.
See Also
firewall-applet(1), firewalld(1), firewall-cmd(1), firewall-config(1), firewalld.conf(5), firewalld.direct(5), firewalld.dbus(5), firewalld.icmptype(5), firewalld.lockdown-whitelist(5), firewall-offline-cmd(1), firewalld.richlanguage(5), firewalld.service(5), firewalld.zone(5), firewalld.zones(5), firewalld.policy(5), firewalld.policies(5), firewalld.ipset(5), firewalld.helper(5)