Tag Archives: iptables

iptables unban ip and ban entire subnet

List entries with line numbers

iptables -L -v --line-numbers

Delete entry

iptables -D name_of_chain number_of_line_with_IP_that_you_want_to_delete

Let’s imagine that we want to unban 91.194.16.60! chain name is ‘f2b-sshd‘ and line number is 10!

f2b-ssh-unban

iptables -D f2b-sshd 10

Example (banning some chinese sh*t)

iptables -A INPUT -s 119.249.54.0/24 -j DROP
iptables -A INPUT -s 121.18.238.0/24 -j DROP

Remove an IP address from the banned SSH list

sudo iptables -D fail2ban-ssh -s banned_ip -j DROP

Remove an IP address from the banned FTP list

sudo iptables -D fail2ban-pure-ftpd -s banned_ip -j DROP

Check if IP address is blocked:

iptables -L -n --line | grep [IP_Address]

If IP address appear as DROP or REJECT, it is blocked.

Unblock IP address from incoming connections

iptables -I INPUT -s [IP_Address] -j ACCEPT

Block IP address from incoming connections

# iptables -A INPUT -s [IP_Address] -j DROP

Here’s a nice article/script to block countries with iptables.