How to Drop or Block Incoming/Attackers IP Address Using null route

Instead of using iptables firewall to block the attacker’s ip, you also can use null route. To implement this on your linux system, you just need to run below command :

Reject the target ip address:

[root@server ~]# route add -host IP-ADDRESS reject

[root@server ~]# route add -host 192.168.2.5 reject