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# Conntrack


<img src="https://netdata.cloud/img/firewall.svg" width="150"/>


Plugin: proc.plugin
Module: /proc/net/stat/nf_conntrack

<img src="https://img.shields.io/badge/maintained%20by-Netdata-%2300ab44" />

## Overview

This integration monitors the connection tracking mechanism of Netfilter in the Linux Kernel.



This collector is supported on all platforms.

This collector supports collecting metrics from multiple instances of this integration, including remote instances.


### Default Behavior

#### Auto-Detection

This integration doesn't support auto-detection.

#### Limits

The default configuration for this integration does not impose any limits on data collection.

#### Performance Impact

The default configuration for this integration is not expected to impose a significant performance impact on the system.


## Metrics

Metrics grouped by *scope*.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.



### Per Conntrack instance



This scope has no labels.

Metrics:

| Metric | Dimensions | Unit |
|:------|:----------|:----|
| netfilter.conntrack_sockets | connections | active connections |
| netfilter.conntrack_new | new, ignore, invalid | connections/s |
| netfilter.conntrack_changes | inserted, deleted, delete_list | changes/s |
| netfilter.conntrack_expect | created, deleted, new | expectations/s |
| netfilter.conntrack_search | searched, restarted, found | searches/s |
| netfilter.conntrack_errors | icmp_error, error_failed, drop, early_drop | events/s |



## Alerts


The following alerts are available:

| Alert name  | On metric | Description |
|:------------|:----------|:------------|
| [ netfilter_conntrack_full ](https://github.com/netdata/netdata/blob/master/health/health.d/netfilter.conf) | netfilter.conntrack_sockets | netfilter connection tracker table size utilization |


## Setup

### Prerequisites

No action required.

### Configuration

#### File

There is no configuration file.
#### Options



There are no configuration options.

#### Examples
There are no configuration examples.


