I want to know about the Ftester tool and my both host are debian systems with iptables as firewall/packet filter. When sending packets from one host to the other I would like to check whether the firewall is working properly or not.
The syntax is not quite clear to me:
What port and what flag should be used to get it work ?
Does flag should be consider with the port?
Please, I need some explaination about it! I searched about it on web a lot but I still don't understand! Any help will be most appreciated! Thank-you! And sorry for my poor English :)