iptables

unban ip

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!

iptables -D f2b-sshd 10

Ban entire subnet

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