how to drop ip immediately hi, i use many ips for game servers. some time i get ddos attack to specific ip adress. i can change ip to other server with that command arping -U -I eth0 ip address but i want, drop that ip.not change to other server. i do ifconfig eth0:340 ipadddress netmask 255.255.255.0 drop but it will drop like hours. thanks.