Block an IP using iptables
To block an IP using iptables, use
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iptables -A INPUT -s IPADDR -j DROP |
Replace IPADDR with IP address you need to block.
To block an IP range
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iptables -A INPUT -s IP_IN_CIDR_FORMAT -j DROP |
Example, bock IP range 159.138.0.0/16
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iptables -A INPUT -s 159.138.0.0/16 -j DROP |
Unblock an IP address
To unblock an IP address, first find the rule number, you can do it with the command
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iptables --list INPUT -n --line-number | grep IP_ADDR_HERE |
Once you find the number of rule to be removed, you can run
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iptables --delete INPUT RULE_NUMBER_HERE |
Example
See iptables