You want to do an ICMP scan on a remote computer using hping2. What is the proper syntax?

Running hping2 with only a hostname and no protocol flag defaults to TCP SYN packets on port 0, not ICMP.

--set-ICMP is not a valid hping2 option; the correct long-form flag for ICMP mode is --icmp, and the short form is -1.

The -i flag in hping2 specifies the interval between sent packets in microseconds and has nothing to do with selecting the ICMP protocol.

The -1 flag explicitly sets hping2 to ICMP mode, equivalent to using the long form --icmp, causing it to send ICMP echo request packets to the target host. Without this flag, hping2 sends TCP packets by default. This is the correct and documented syntax for conducting ICMP-based host probing with hping2.