64 lines
2.2 KiB
Markdown
64 lines
2.2 KiB
Markdown
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# Synproxy Input Plugin
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The synproxy plugin gathers the synproxy counters. Synproxy is a Linux netfilter
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module used for SYN attack mitigation. The use of synproxy is documented in
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`man iptables-extensions` under the SYNPROXY section.
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## Global configuration options <!-- @/docs/includes/plugin_config.md -->
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In addition to the plugin-specific configuration settings, plugins support
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additional global and plugin configuration settings. These settings are used to
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modify metrics, tags, and field or create aliases and configure ordering, etc.
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See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
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[CONFIGURATION.md]: ../../../docs/CONFIGURATION.md#plugins
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## Configuration
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```toml @sample.conf
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# Get synproxy counter statistics from procfs
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# This plugin ONLY supports Linux
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[[inputs.synproxy]]
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# no configuration
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```
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The synproxy plugin does not need any configuration
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## Metrics
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The following synproxy counters are gathered
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- synproxy
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- fields:
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- cookie_invalid (uint32, packets, counter) - Invalid cookies
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- cookie_retrans (uint32, packets, counter) - Cookies retransmitted
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- cookie_valid (uint32, packets, counter) - Valid cookies
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- entries (uint32, packets, counter) - Entries
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- syn_received (uint32, packets, counter) - SYN received
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- conn_reopened (uint32, packets, counter) - Connections reopened
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## Sample Queries
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Get the number of packets per 5 minutes for the measurement in the last hour
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from InfluxDB:
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```sql
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SELECT difference(last("cookie_invalid")) AS "cookie_invalid", difference(last("cookie_retrans")) AS "cookie_retrans", difference(last("cookie_valid")) AS "cookie_valid", difference(last("entries")) AS "entries", difference(last("syn_received")) AS "syn_received", difference(last("conn_reopened")) AS "conn_reopened" FROM synproxy WHERE time > NOW() - 1h GROUP BY time(5m) FILL(null);
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```
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## Troubleshooting
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Execute the following CLI command in Linux to test the synproxy counters:
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```sh
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cat /proc/net/stat/synproxy
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```
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## Example Output
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This section shows example output in Line Protocol format.
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```text
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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
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```
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