July 2018
Beginner
264 pages
8h 9m
English
Content preview from Bash Cookbook
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How to do it...
Now, we are going to see some of the iptables commands:
- Run the following command to list all the rules that are set on the server:
$ sudo iptables -L
- To allow incoming traffic from a specific port, use the following command:
$ sudo iptables -A INPUT -p tcp --dport 4321 -j ACCEPT
This rule will allow incoming traffic from port 4321. The firewall needs to be restarted to make this rule effective.
Using iptables, you can block the incoming traffic. For that, run the following command:
$ sudo iptables -A INPUT -j DROP
- If any new rules are added in the iptables, we should save them first. Otherwise, after a system reboot, they will disappear. Run the following command to saving the iptables after adding new rules:
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