In newer versions like RHEL7, the firewall is still powered by iptables only the management part is Reject The Input handled by a new daemon called firewalld. With below switches —. In the above Reject The Input we are blocking incoming connections from IP If you see the output of rules listing, you can see our rule is defined properly in iptables.
Here chain Reject The Input be any of the three: input incoming connectionoutput outgoing connectionor forward forwarding connection. Also, action can be accepted, Reject The Input, reject, or drop, Reject The Input. Same as single IP address, whole address range can be defined in rule too. The above command can be used only instead of IP address you need to define range there. You can choose the chain and action of your choice depending on which rule you want to configure. All the configuration done above is not permanent and will be washed away when iptable services restarted or server reboots.
To make all these configured rules permanent you need to write these rules. Sign up to join this community. The best answers are voted up and rise to the top. Ask Question. Asked 6 years, 7 months ago. Active 1 year, 10 months ago. Viewed 28k times. There's an example of iptables rules on archlinux wiki: Generated by iptables-save v1. So, I have two questions: What do the three rules do? Gilles 'SO- stop being evil' k gold badges silver badges bronze badges.
Mikhail Morfikov Mikhail Morfikov 8, 15 15 gold badges 54 54 silver badges 87 87 bronze badges. Active Oldest Votes.
What Reject The Input the three rules do? Kiwy - Read the link and try it yourself. This is because legitimate users suffer from a slow connection while waiting for the conection to time out and crackers merely configure their tools to not wait for a time out.
I do not go with that conclusion. Reject generates an ICMP-answer that can by analysed. Based on this analysis good attack engines can derive the OS that is being used. So on a system where all ports are known drop might be better. This applies to servers in a production environment. A firewall that only forwards certain ports is even better. Note that the quoted text has one more paragraph, an update, that says DROP is better if you have a DDoS attack, which is relatively rare, but when it happens, it's probably good to have it Sign up or log in Sign up using Google.
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