Ping from on-premise to all my EC2 instance has packet loss

Question

I need to monitor all my EC2 instance using Nagios from on-premise using Ping but when It's shows packet loss nearly 30% many time. I checked my hardware performance include CPU or RAM it is okay. 
PS: I also monitor using Nagios with service Ping to other EC2 instance on my other account but it's working just fine.

Answer

Hi, this very probably comes from the fact that your different EC2 instances are protected by different security groups: one allowing ICMP (ping) and the other not. So, please, identify those 2 sec groups and align them for ICMP.

See details to allow ping (specifically): https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/security-group-rules-reference.html#sg-rules-ping.

If groups are same, the second possible cause is absence of public IP for the failing one. 
See https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-instance-addressing.html#concepts-public-addresses to check if you have one for your instance and how to add it if not.

Answer

I would start by investigating the connection from on-prem to AWS. Below are two guides that can help to troubleshoot the packet loss. 
How do I troubleshoot packet loss on my VPN connection? https://repost.aws/knowledge-center/troubleshoot-vpn-packet-loss
How can I troubleshoot packet loss for my Direct Connect connection? https://repost.aws/knowledge-center/direct-connect-packet-loss

Ping from on-premise to all my EC2 instance has packet loss

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