Null Filtering Not Working

iamDT03 — Wed, 11 Nov 2020 22:04:39 GMT

Greetings all. I am having some trouble getting syslog data to filter with regards to nullQueue. Below are what my config files look like and some additional troubleshooting I've taken so far.

inputs.conf

[udp://5514]
connection_host = ip
index = org_index
sourcetype = cisco:firepower:syslog

props.conf

[source::udp:5514]
TRANSFORMS-set= setnull,setparsing

transforms.conf

[setnull]
REGEX = .
DEST_KEY = queue
FORMAT = nullQueue

[setparsing]
REGEX = \%FTD-\d-(430002|430003)
DEST_KEY = queue
FORMAT = indexQueue

My environment flows Firepower syslog > Heavy Fwd (on prem) > Splunk Cloud and the above configs are on the Heavy Fwd.

In the syslog stream, there are "Correlation Event" logs I am trying to drop. Above I am trying to ingest only message ID's of 430002 and 430003 and drop everything else, however, Correlation Events are still coming in. I've also tried the alternative where I'm targeting Correlation Event in the regex in an effort to drop them, also unsuccessful. Below are some additional troubleshooting steps I've taken.

reformatting the source as [source::udp://5514] in props.conf
removed spaces before and after the equals signs for each attribute
removed the line "REGEX = ." in transforms.conf
tried the sourcetype in props.conf, so [cisco:firepower:syslog]
tried different regex matches, using regex101
restarting Heavy Fwd after each change

Here is the Splunk Doc I've been working with primarily: https://docs.splunk.com/Documentation/Splunk/8.1.0/Forwarding/Routeandfilterdatad#Discard_specific_events_and_keep_the_rest

Any help is greatly appreciated!

Re: Null Filtering Not Working

iamDT03 — Thu, 12 Nov 2020 04:45:29 GMT

This issue has been resolved. The [setnull] transform stanza name was conflicting with another transform stanza from a separate add-on. Making the following changes to props.conf and transforms.conf remedied the problem.

#props.conf [source::udp:5514] TRANSFORMS-set= dropEvents,setparsing #transforms.conf [dropEvents] REGEX = . DEST_KEY = queue FORMAT = nullQueue [setparsing] REGEX = \%FTD-\d(430002|430003) DEST_KEY = queue FORMAT = indexQueue

topic Null Filtering Not Working in Getting Data In

Null Filtering Not Working

Re: Null Filtering Not Working