1

First of all I am new to Ubuntu server. I am still trying to understand and learning about how does firewall. I want my firewall like if you fail 3 times it will time out. Is there any body could be explain more to me about this. I have read web about firewall but i quilt dont get it

1
  • Hello Jack, Welcome to Askubuntu. While asking a question please provide as much details as you can get like here we need to know your query to be explained a bit broadly and also provide which version of Ubuntu you are using and other relevant info.
    – heemayl
    Jan 19, 2015 at 22:17

1 Answer 1

0

If I understand, you will block more then 3 fail connection on some service on server? You can do that with iptables - firewall

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

This rule will block an IP if it attempts more than 3 connections per minute to SSH. You can change destination port from 22 for ssh to 80 for http or 110 for pop3 ...

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .