To delete firewall rules in Linux, you can use the iptables command. iptables is a firewall service in Linux that allows you to configure and manage the firewall rules.
To delete a specific firewall rule, you need to know the line number of the rule. You can use the iptables command with the -L option to list the current firewall rules and their line numbers:
iptables -L --line-numbers
Once you have the line number of the rule you want to delete, you can use the following command to delete the rule:
iptables -D <chain> <rulenum>
where <chain> is the name of the chain the rule belongs to (e.g., INPUT, OUTPUT, FORWARD) and <rulenum> is the line number of the rule.
For example, if you want to delete the rule with line number 5 in the INPUT chain, you can use the following command:
iptables -D INPUT 5
It’s important to note that deleting firewall rules will affect the security of your system, so it’s important to be careful when making changes to the firewall rules. Before making any changes, it’s a good idea to backup your firewall rules so that you can restore them if necessary.