50 lines
1.7 KiB
Markdown
50 lines
1.7 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 module used for SYN attack mitigation.
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The use of synproxy is documented in `man iptables-extensions` under the SYNPROXY section.
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### Configuration
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The synproxy plugin does not need any configuration
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```toml
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[[inputs.synproxy]]
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# no configuration
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```
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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 from InfluxDB:
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```
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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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```
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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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```
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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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