Configuring non-root users to send ICMP datagrams
How does a non-root user ping another machine?
Classically, that has been to make ping setuid. After that, it had the raw
network capability so it could send without root privileges but that’s a fairly
coarse privilege - it can create any type of socket, not just ICMP.
Better to use the newest option net.ipv4.ping_group_range.
Security concerns? Fair, but consider: Fedora and Arch enable this for all
users by default.