Admin can block the IP's so that it disallows complete access to Node from that source IP. This is useful to block the IP Address from which invalid login attempts or unauthorized access to Node is attempted.
To block an IP,
Log-in to the node with admin access privilege.
Click Security > Security Settings. The Security settings page is displayed.
Click BlockedIPs. The Blocked IPs page is displayed.
Click Block a New IP. The Block a IP page is displayed.