Traffic throttling using iptables

It can be useful in certain cases to limit the frequency of certain request as described here.

Key code:

iptables -I INPUT -p tcp --dport 22 -i eth0 -m state --state NEW -m recent \
  --set

iptables -I INPUT -p tcp --dport 22 -i eth0 -m state --state NEW -m recent \
  --update --seconds 60 --hitcount 4 -j DROP

To view existing rules and/or delete existing one, one can use these instructions.