ping | psylogical.org

Disable ping reponse

temporary
echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all

permanent
vim /etc/sysctl.conf net.ipv4.icmp_echo_ignore_all=0

How to ping multiple IP

Ping mu
fping -g 192.168.100.1 192.168.100.100

Or whole subnet
fping -gar1 83.40.128.0/24 2> null