This simple monitoring method can be used to monitor certain IP like gateway or server to check the network's reliability and server's availability.
For this in windows open terminal > make a folder to store the log file.
mkdir ping_log
Get inside the folder ping_log
cd .\ping_log\
After getting into the directory run the below command
ping -t xx.xx.xx.xx >ISP_GW_ping.txt
This will create file in .txt form ans store ping report dynamically in filename.txt file.
This is simple but effective way to monitor network's reliability and server's availability.