Displays Average TCP Round Trip Time for a host.
| OS | Linux | Windows | OS X |
|---|---|---|---|
| Supported | v | - | v |
In order to provide the TCP round trip time metric, the optional TCP timestamp settings must be enabled on the target OS. Depending on the OS, it may or may not be enabled by default. The table below shows the currently supported OS's and how to enable the flag.
| OS | Enable Command | Default setting |
|---|---|---|
| OS/X 10.8 to 10.10 | sudo sysctl net.inet.tcp.rfc1323=1 | Enabled |
| OS/X 10.11 | Unknown - feature was removed | Unknown |
| Ubuntu | echo 1 > /proc/sys/net/ipv4/tcp_timestamps | Enabled |
| CentOS | echo 1 > /proc/sys/net/ipv4/tcp_timestamps | Enabled |
| FreeBSD | sudo sysctl net.inet.tcp.rfc1323=1 | Enabled |
| Ubuntu | echo 1 > /proc/sys/net/ipv4/tcp_timestamps | Enabled |
| ArchLinux | echo 1 > /proc/sys/net/ipv4/tcp_timestamps | Enabled |
| OpenSuse | echo 1 > /proc/sys/net/ipv4/tcp_timestamps | Enabled |
| Alpine | echo 1 > /proc/sys/net/ipv4/tcp_timestamps | Enabled |
| Field Name | Description |
|---|---|
| Source | The Source to display in the legend for the data. It will default to the hostname of the server. |
| Polling Interval | A numeric value representing polling interval time in miliseconds (ex 1000 for 1 Sec). |
| Metric Name | Description |
|---|---|
| TCP RTT | TCP round trip time |