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Iptables module
editIptables module
editThis is a module for iptables and ip6tables logs. It parses logs received over the network via syslog or from a file. Also, it understands the prefix added by some Ubiquiti firewalls, which includes the rule set name, rule number and the action performed on the traffic (allow/deny).
When you run the module, it performs a few tasks under the hood:
-
Sets the default input to
syslog
and binds tolocalhost
port9001
(but don’t worry, you can override the defaults). - Uses an ingest pipeline to parse and process the log lines, shaping the data into a structure suitable for visualizing in Kibana.
- Deploys dashboards for visualizing the log data.
Read the quick start to learn how to configure and run modules.
Configure the module
editYou can further refine the behavior of the iptables
module by specifying
variable settings in the
modules.d/iptables.yml
file, or overriding settings at the command line.
You must enable at least one fileset in the module. Filesets are disabled by default.
The module is by default configured to run via syslog on port 9001. However it can also be configured to read from a file path. See the following example.
- module: iptables log: enabled: true var.paths: ["/var/log/iptables.log"] var.input: "file"
Variable settings
editEach fileset has separate variable settings for configuring the behavior of the
module. If you don’t specify variable settings, the iptables
module uses
the defaults.
For advanced use cases, you can also override input settings. See Override input settings.
When you specify a setting at the command line, remember to prefix the
setting with the module name, for example, iptables.log.var.paths
instead of log.var.paths
.
log
log fileset settings
edit-
var.paths
-
An array of glob-based paths that specify where to look for the log files. All
patterns supported by Go Glob
are also supported here. For example, you can use wildcards to fetch all files
from a predefined level of subdirectories:
/path/to/log/*/*.log
. This fetches all.log
files from the subfolders of/path/to/log
. It does not fetch log files from the/path/to/log
folder itself. If this setting is left empty, Filebeat will choose log paths based on your operating system. -
var.syslog_host
-
The interface to listen to UDP based syslog traffic. Defaults to
localhost
. Set to0.0.0.0
to bind to all available interfaces. -
var.syslog_port
-
The UDP port to listen for syslog traffic. Defaults to
9001
Ports below 1024 require Filebeat to run as root.
-
var.tags
-
A list of tags to include in events. Including
forwarded
indicates that the events did not originate on this host and causeshost.name
to not be added to events. Defaults to[iptables, forwarded]
.
Time zone support
editThis module parses logs that don’t contain time zone information. For these logs,
Filebeat reads the local time zone and uses it when parsing to convert the
timestamp to UTC. The time zone to be used for parsing is included in the event
in the event.timezone
field.
To disable this conversion, the event.timezone
field can be removed with
the drop_fields
processor.
If logs are originated from systems or applications with a different time zone to
the local one, the event.timezone
field can be overwritten with the original
time zone using the add_fields
processor.
See Processors for information about specifying processors in your config.
Example dashboard
editThis module comes with sample dashboards showing geolocation and network protocols used. One for all iptables logs:
and one specific for Ubiquiti Firewall logs:
Fields
editFor a description of each field in the module, see the exported fields section.
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