RHEL 7/CentOS 7 introduced firewalld as a replacement for the previous iptables service.
Firewalld provides a dynamically managed firewall with support for network/firewall zones to define the trust level of network connections or interfaces. It has support for IPv4, IPv6 firewall settings.The firewall model with iptables was static and every change required a complete firewall restart.
In this tutorial, we learn how to enable/disable a port in the firewall.
To check the current firewall rules, use the following command
To check the currently allowed ports in firewall, use the following command
Open/Enable Port
Firewall rule settings are managed by firewalld service daemon. A command-line client called firewall-cmd can talk to this daemon to update firewall rules permanently.
For Example, To open a port TCP/80 permanently, use following commands.
Don't forget --permanent flag, Without --permanent flag, the firewall rule will not work after reboots.
Firewalld provides a dynamically managed firewall with support for network/firewall zones to define the trust level of network connections or interfaces. It has support for IPv4, IPv6 firewall settings.The firewall model with iptables was static and every change required a complete firewall restart.
In this tutorial, we learn how to enable/disable a port in the firewall.
To check the current firewall rules, use the following command
# sudo iptables -L
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To check the currently allowed ports in firewall, use the following command
# firewall-cmd --zone=public --list-ports
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Open/Enable Port
Firewall rule settings are managed by firewalld service daemon. A command-line client called firewall-cmd can talk to this daemon to update firewall rules permanently.
For Example, To open a port TCP/80 permanently, use following commands.
# sudo firewall-cmd --zone=public --add-port=80/tcp --permanent
# sudo firewall-cmd –-reload
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Don't forget --permanent flag, Without --permanent flag, the firewall rule will not work after reboots.
Close/Disable/Remove Port
For Example, To close a port TCP/80 permanently, use following commands.
# firewall-cmd --zone=public --remove-port=80/tcp --permanent
# sudo firewall-cmd --reload
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Here also Don't forget --permanent flag, Without --permanent flag, the firewall rule will not work after reboots.
