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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
Plugin Configuration Fields
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).