How to Change the Reply ping to “host-unreachable” :

your ip : 23.24.25.26

your command : ping 23.24.25.26

Reply message : 32 bytes from 23.24.25.26 : icmp_seq=2 …

1 – Connect to the server (OS is Linux) :

2 – run the following command

# iptables -A INPUT -p icmp -j REJECT –reject-with icmp-host-unreachable