The correct syntax to block an IP address under Linux using iptables is as follows:
Open a command-line terminal (select Applications > Accessories > Terminal), or login to remote server using the ssh and then type the following command block an ip address 1.2.3.4 as follows:
/sbin/iptables -A INPUT -s BAN-IP-ADDRESS -j DROP
/sbin/iptables -A INPUT -s BAN-IP-ADDRESS/MASK -j DROP
# /sbin/iptables -A INPUT -s 65.55.44.100 -j DROP
To view blocked IP address, enter:
# iptables -L INPUT -v -n
OR
# iptables -L INPUT -v -n | less
Task: Check Banned IP's Linux
Use the grep command as follows to verify that an IP address 1.2.3.4 is blocked or not:# iptables -L INPUT -v -n | grep "1.2.3.4"
How Do I Delete or Unblock IP Address 1.2.3.4?
Use the following syntax to delete or unblock an IP address under Linux, enter:# iptables -D INPUT -s 1.2.3.4 -j DROP
Finally, make sure you save the firewall:
# service iptables save
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