---
title: ''
description: Telegraf plugin for collecting metrics from Synproxy
url: https://docs.influxdata.com/telegraf/v1/input-plugins/synproxy/
estimated_tokens: 458
product: Telegraf Enterprise
version: v1
publisher: InfluxData
canonical: https://docs.influxdata.com/telegraf/v1/input-plugins/synproxy/
date: '2026-05-21T20:10:18+02:00'
lastmod: '2026-05-21T20:10:18+02:00'
---

==========

* Telegraf v1.13.0+

[Plugin source](https://github.com/influxdata/telegraf/tree/v1.39.1/plugins/inputs/synproxy/)[Download configuration](https://raw.githubusercontent.com/influxdata/telegraf/refs/tags/v1.39.1/plugins/inputs/synproxy/sample.conf)

# Synproxy Input Plugin

This plugin gathers metrics about the Linux netfilter’s [synproxy](https://wiki.nftables.org/wiki-nftables/index.php/Synproxy)module used for mitigating SYN attacks.

**Introduced in:** Telegraf v1.13.0**Tags:** network**OS support:** linux

## Global configuration options

Plugins support additional global and plugin configuration settings for tasks
such as modifying metrics, tags, and fields, creating aliases, and configuring
plugin ordering. See [CONFIGURATION.md](/telegraf/v1/configuration/#plugins) for more details.

## Configuration

```toml
# Get synproxy counter statistics from procfs
# This plugin ONLY supports Linux
[[inputs.synproxy]]
  # no configuration
```

## Troubleshooting

Execute the following CLI command in Linux to test the synproxy counters:

```sh
cat /proc/net/stat/synproxy
```

## Metrics

The following synproxy counters are gathered

* synproxy
  * fields:
    * cookie\_invalid (uint32, packets, counter) - Invalid cookies
    * cookie\_retrans (uint32, packets, counter) - Cookies retransmitted
    * cookie\_valid (uint32, packets, counter) - Valid cookies
    * entries (uint32, packets, counter) - Entries
    * syn\_received (uint32, packets, counter) - SYN received
    * conn\_reopened (uint32, packets, counter) - Connections reopened

## Example Output

This section shows example output in Line Protocol format.

```text
synproxy,host=Filter-GW01,rack=filter-node1 conn_reopened=0i,cookie_invalid=235i,cookie_retrans=0i,cookie_valid=8814i,entries=0i,syn_received=8742i 1549550634000000000
```