#!/bin/bashwhile truedobadip=$(lastb -i -a | awk '/ssh:notty/ {print $NF}'|sort|uniq -c|awk '($1>3)
.
#!/bin/bash
while true
do
badip=$(lastb -i -a | awk '/ssh:notty/ {print $NF}'|sort|uniq -c|awk '($1>3) {print $2}')
for i in $badip
do
iptables -t filter -I INPUT -s $i -p tcp --dport 22 -j DROP
done
: > /var/log/btmp
sleep 10s
done