How to block access to a server by IP address on Linux

Sometimes you might want to block connects to your server by IP address. E.g. when someone tries to attack your system. This can be done in several different ways, e.g. with iptables (firewall) rules or by setting up a reject route.

Reject access with Linux route command

Using iptables sometimes causes conflicts with installed firewalls so that I will use the route command here. The command is:

route add -host reject

Replace with the IP address that you want to block and execute the command as root user on the shell.

Use this command to remove the blocked route:

route del reject

To list all blocked routes, use the command:

route -n

Leave a Comment