Ubuntu Manpage: firewalld.conf - firewalld configuration file

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:

DefaultZone
This 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.

MinimalMark
Deprecated. This option is ignored and no longer used. Marks are no longer used internally.

CleanupModulesOnExit
Setting this option to yes or true unloads all firewall-related kernel modules when firewalld is
stopped. The default value is no or false.

CleanupOnExit
If 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.

IPv6_rpfilter
Performs reverse path filtering (RPF) on IPv6 packets as per RFC 3704. Possible values: - strict:
Performs "strict" filtering as per RFC 3704. This check verifies that the in ingress interface is the
same interface that would be used to send a packet reply to the source. That is, ingress == egress. -
loose: Performs "loose" filtering as per RFC 3704. This check only verifies that there is a route
back to the source through any interface; even if it's not the same one on which the packet arrived.
- strict-forward: This is almost identical to "loose", but does not perform RPF for packets targeted
to the host (INPUT). - loose-forward: This is almost identical to "loose", but does not perform RPF
for packets targeted to the host (INPUT). - no: RPF is completely disabled. The rp_filter for IPv4 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.
Alternatively one of the variants that only does RPF on forwarded packets may be used.

IndividualCalls
If 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.

LogDenied
Add 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, multicast and off. The default setting is
off, which disables the logging.

AutomaticHelpers
Deprecated. This option is ignored and no longer used.

FirewallBackend
Selects the firewall backend implementation. Possible values are; nftables (default), or iptables.
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.

FlushAllOnReload
Flush 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".

ReloadPolicy
The policy during reload. By default, all traffic except established connections is dropped while
reloading the firewall rules. This can be overridden for INPUT, FORWARD and OUTPUT. The accepted
values are "DROP", "REJECT" and "ACCEPT", which then applies to all tables. Alternatively, the policy
can be specified per table, like "INPUT:REJECT,FORWARD:DROP,OUTPUT:ACCEPT". Defaults to
"INPUT:DROP,FORWARD:DROP,OUTPUT:DROP".

RFC3964_IPv4
As 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".

AllowZoneDrifting
Deprecated. This option is ignored and no longer used.

NftablesFlowtable
This may improve forwarded traffic throughput by enabling nftables flowtable. It is a software
fastpath and avoids calling nftables rule evaluation for data packets. Its value is a space separate
list of interfaces. Example value "eth0 eth1". Defaults to "off".

NftablesCounters
If set to yes, add a counter to every nftables rule. This is useful for debugging and comes with a
small performance cost. Defaults to "no".

NftablesTableOwner
If set to yes, the generated nftables rule set will be owned exclusively by firewalld. This prevents
other entities from mistakenly (or maliciously) modifying firewalld's rule set. If you intentionally
modify firewalld's rules, then you will have to set this to "no". Defaults to "yes".

NOTES

       firewalld home page:
           http://firewalld.org

AUTHORS