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How to Block an ip address using iptables

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You can block an user with an ip address from accessing your system using the iptables.

For that follow these steps.

1. Open up a shell and login as root.

2. now type the command below to block the ip(XXX.XXX.XXX.XXX).
# iptables -I INPUT -s XXX.XXX.XXX.XXX -j DROP

3. See whether the new rule has been added.
# /sbin/iptables -L -n

You can find other options to choose from with the following command:

# iptables --help
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