---
title: Telegraf Documentation
description: Telegraf plugin for collecting metrics from Synproxy
url: https://docs.influxdata.com/telegraf/v1/input-plugins/synproxy/
estimated_tokens: 759
product: Telegraf
version: v1
---

-   Telegraf v1.13.0+

# 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
```

#### Related

-   [Configure plugins](/telegraf/v1/configure_plugins/)
-   [Synproxy Plugin Source](https://github.com/influxdata/telegraf/tree/v1.38.4/plugins/inputs/synproxy/README.md)