Update docs.asciidoc (elastic#11852) (elastic#12046)

* Update docs.asciidoc Added in a short note on a few of the other configurable variables. * Make update
leweafan · May 9, 2019 · 3c75644 · 3c75644
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diff --git a/filebeat/docs/modules/iptables.asciidoc b/filebeat/docs/modules/iptables.asciidoc
@@ -70,6 +70,17 @@ include::../include/config-option-intro.asciidoc[]
 
 include::../include/var-paths.asciidoc[]
 
+*`var.syslog_host`*::
+
+The interface to listen to UDP based syslog traffic. Defaults to `localhost`.
+Set to `0.0.0.0` to bind to all available interfaces.
+
+*`var.syslog_port`*::
+
+The UDP port to listen for syslog traffic. Defaults to `9001`
+
+NOTE: Ports below 1024 require Filebeat to run as root.
+
 :has-dashboards!:
 
 :fileset_ex!:

diff --git a/x-pack/filebeat/module/iptables/_meta/docs.asciidoc b/x-pack/filebeat/module/iptables/_meta/docs.asciidoc
@@ -65,6 +65,17 @@ include::../include/config-option-intro.asciidoc[]
 
 include::../include/var-paths.asciidoc[]
 
+*`var.syslog_host`*::
+
+The interface to listen to UDP based syslog traffic. Defaults to `localhost`.
+Set to `0.0.0.0` to bind to all available interfaces.
+
+*`var.syslog_port`*::
+
+The UDP port to listen for syslog traffic. Defaults to `9001`
+
+NOTE: Ports below 1024 require Filebeat to run as root.
+
 :has-dashboards!:
 
 :fileset_ex!: