Burst ICMP request lead to packet loss

[BriceSchaffner]

When pinging a lots of address (more than 500) on some system/network the burst ICMP request can led to a lot of packet loss. This can be avoided by adding a small delay between each ICMP request (1-5 ms). This has been observed on a Windows Server 2012 R2 Standard (64 bit).

[Tzvika-m]

This also happens in some network configurations with more than 50 addresses.
Observed on ubuntu 18.04 (dockerized) and macOS 10.14.4

[siddeshpawar]

Instead of delay we can work with concurrency or multi-threading. pushing all the IP. Hope the burst ICMP will work.