peplink SD - Standalone menu options > System > Tools; Ping; Traceroute

Standalone menu options > System > Tools
Ping
The ping test tool sends pings through a specified Ethernet interface or a SpeedFusion VPN
connection.
You can specify the number of pings in the field Number of times to a maximum number of 10
times.
Packet Size can be set to a maximum of 1472 bytes.
A system administrator can use the ping utility to manually check the connectivity of a particular
LAN/WAN connection.
Traceroute