If your pfSense does not have the performance or has huge storage of handling a network probe such as ntopng package, you can send your logs to an external system. With the use of NetFlow you can do this with softflowd package.
First install softflowd via System>Package Manager, once installed you need to edit the settings for softflowd in the ‘Services’ tab.
Here you must enable softflowd, then state all the interface you wish to monitor. Host will be the I.P that is hosting the docker. NetFlow port ‘2055’, Sampling is down to your needs, NetFlow version ‘9’, Flow Tracking Level to ‘Full’ to log everything.
On your QNAP you must create the docker using the ‘Create Application’, this uses the Docker Compose editor to create the docker instance without using a GUI.
Give the application a name, and then copy this YAML configuration for Elasticsearch.
This will use robcowart/elastiflow-logstash-oss docker, you can checkout the docker here https://hub.docker.com/r/robcowart/elastiflow-logstash-oss
version: '3' services: elastiflow-elasticsearch-oss: image: docker.elastic.co/elasticsearch/elasticsearch-oss:7.5.0 container_name: elastiflow-elasticsearch-oss restart: 'no' ulimits: memlock: soft: -1 hard: -1 network_mode: host volumes: - elastiflow_es:/usr/share/elasticsearch/data environment: # JVM Heap size # - this should be at least 2GB for simple testing, receiving only a few flows per second. # - for production environments upto 31GB is recommended. ES_JAVA_OPTS: '-Xms2g -Xmx2g' cluster.name: elastiflow bootstrap.memory_lock: 'true' network.host: 0.0.0.0 http.port: 9200 discovery.type: 'single-node' indices.query.bool.max_clause_count: 8192 search.max_buckets: 100000 action.destructive_requires_name: 'true' elastiflow-kibana-oss: image: docker.elastic.co/kibana/kibana-oss:7.5.0 container_name: elastiflow-kibana-oss restart: 'no' depends_on: - elastiflow-elasticsearch-oss network_mode: host environment: SERVER_HOST: 0.0.0.0 SERVER_PORT: 5601 ELASTICSEARCH_HOSTS: "http://127.0.0.1:9200" KIBANA_DEFAULTAPPID: "dashboard/653cf1e0-2fd2-11e7-99ed-49759aed30f5" LOGGING_QUIET: 'true' elastiflow-logstash-oss: image: robcowart/elastiflow-logstash-oss:3.5.3 container_name: elastiflow-logstash-oss restart: 'no' depends_on: - elastiflow-elasticsearch-oss network_mode: host environment: # JVM Heap size - this MUST be at least 3GB (4GB preferred) LS_JAVA_OPTS: '-Xms4g -Xmx4g' # ElastiFlow global configuration ELASTIFLOW_DEFAULT_APPID_SRCTYPE: "__UNKNOWN" # Name resolution option ELASTIFLOW_RESOLVE_IP2HOST: "false" ELASTIFLOW_NAMESERVER: "127.0.0.1" ELASTIFLOW_NETFLOW_IPV4_PORT: 2055 ELASTIFLOW_SFLOW_IPV4_PORT: 6343 ELASTIFLOW_IPFIX_TCP_IPV4_PORT: 4739 volumes: elastiflow_es:
You can access Kibana that will visualise the Elasticsearch data, by accessing it via http://[I.P Address]:5601. It will initially show nothing and it need to import a ready made dashboard to become useful.
To import the dashboard you need to go to Management>’Saved Objects’ and click on ‘Import’
You must download this ndjson file from https://github.com/robcowart/elastiflow/blob/master/kibana/elastiflow.kibana.7.5.x.ndjson
Right click ‘Download’ button and ‘Save Link As’, make sure it does not save as .txt file format. Select the elestiflow.kibana.7.5.x.ndjson file to import.
Once import is successful, we need to make a index pattern for the dashboard to retrieve the Netflow. Goto Management>’Index Patterns’ and click on ‘Create Index Pattern’.
Just put a wildcard ‘*’ to tell it to use all.
Select ‘@timestamp’ as the time.
With the imported ‘Dashboard’ you can see a list of pre made dashboards for NetFlow
There is tons of data, because of this the storage requirement is huge. Here is Geo Location:
Here is Flows for Client to Server:
This help lessen the work load for pfSense machine itself, and it could be useful for your use case.