- Linux overwrites identifier and checksum fields

- macOS requires correct checksum calculation

- macOS includes IP header in response, Linux doesn't

I think this is the kind of subtle difference that would trip up even experienced programmers

So... why? Should I now add "in C" or "in assembly" to the end of all my article titles?

1. You can just add the capability CAP_NET_RAW to your process, at which point it can ping freely

2. There's a sysctl that allows for unprivileged ping "net.ipv4.ping_group_range" which can be used at the host level to allow different groups to use ICMP ping.