net.inet.tcp.stats
net.inet.tcp.stats
Plugin: freebsd.plugin Module: net.inet.tcp.stats
Overview
Collect overall information about TCP connections.
The plugin calls sysctl function to collect necessary data.
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.
Setup
Prerequisites
No action required.
Configuration
File
The configuration file name for this integration is netdata.conf.
Configuration for this specific integration is located in the [plugin:freebsd:net.inet.tcp.stats] section within that file.
The file format is a modified INI syntax. The general structure is:
[section1]
option1 = some value
option2 = some other value
[section2]
option3 = some third value
You can edit the configuration file using the edit-config script from the
Netdata config directory.
cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config netdata.conf
Options
| Name | Description | Default | Required |
|---|---|---|---|
| ipv4 TCP packets | Enable or disable ipv4 TCP packets metric. | yes | no |
| ipv4 TCP errors | Enable or disable pv4 TCP errors metric. | yes | no |
| ipv4 TCP handshake issues | Enable or disable ipv4 TCP handshake issue metric. | yes | no |
| TCP connection aborts | Enable or disable TCP connection aborts metric. | auto | no |
| TCP out-of-order queue | Enable or disable TCP out-of-order queue metric. | auto | no |
| TCP SYN cookies | Enable or disable TCP SYN cookies metric. | auto | no |
| TCP listen issues | Enable or disable TCP listen issues metric. | auto | no |
| ECN packets | Enable or disable ECN packets metric. | auto | no |
Examples
There are no configuration examples.
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 net.inet.tcp.stats instance
These metrics show TCP connections statistics.
This scope has no labels.
Metrics:
| Metric | Dimensions | Unit |
|---|---|---|
| ipv4.tcppackets | received, sent | packets/s |
| ipv4.tcperrors | InErrs, InCsumErrors, RetransSegs | packets/s |
| ipv4.tcphandshake | EstabResets, ActiveOpens, PassiveOpens, AttemptFails | events/s |
| ipv4.tcpconnaborts | baddata, userclosed, nomemory, timeout, linger | connections/s |
| ipv4.tcpofo | inqueue | packets/s |
| ipv4.tcpsyncookies | received, sent, failed | packets/s |
| ipv4.tcplistenissues | overflows | packets/s |
| ipv4.ecnpkts | InCEPkts, InECT0Pkts, InECT1Pkts, OutECT0Pkts, OutECT1Pkts | packets/s |
Alerts
The following alerts are available:
| Alert name | On metric | Description |
|---|---|---|
| 1m_ipv4_tcp_resets_sent | ipv4.tcphandshake | average number of sent TCP RESETS over the last minute |
| 10s_ipv4_tcp_resets_sent | ipv4.tcphandshake | average number of sent TCP RESETS over the last 10 seconds. This can indicate a port scan, or that a service running on this host has crashed. Netdata will not send a clear notification for this alarm. |
| 1m_ipv4_tcp_resets_received | ipv4.tcphandshake | average number of received TCP RESETS over the last minute |
| 10s_ipv4_tcp_resets_received | ipv4.tcphandshake | average number of received TCP RESETS over the last 10 seconds. This can be an indication that a service this host needs has crashed. Netdata will not send a clear notification for this alarm. |