05 How To Allow Custom Ports in Firewall | Allow Multiple Ports in Firewall | Working with firewall-cmd command line

How To Allow Custom Ports in Firewall | Allow Multiple Ports in Firewall

In this topic we will add custom single and multiple ports in firewall

We will add 10000 TCP and 10001 UDP port in linuxtopic zone , below command

To add single port in firewall

firewall-cmd --list-all

firewall-cmd --zone=linuxtopic --add-port=10000/tcp
firewall-cmd --zone=linuxtopic --add-port=10001/udp

Note: Here we add both ports temporary to add permanently you can add  --permanent 

To add firewall ports in permanent

firewall-cmd --zone=linuxtopic --add-port=10000/tcp --permanent
firewall-cmd --zone=linuxtopic --add-port=10001/udp --permanent

To add multiple ports in firewalld

We will add 10010 to 10020 tcp and 10010 to 10015 udp ports in firewall

firewall-cmd --zone=linuxtopic --add-port=10010-10020/tcp --permanent
firewall-cmd --zone=linuxtopic --add-port=10010-10015/udp --permanent

firewall-cmd --reload

How to allow port Instead of service in firewall, first we will check which ports is used by service. we can get info with following command, for the example of samba service

firewall-cmd --info-service=samba

Here we get 137/tcp 138/udp 139/tcp and 445/tcp port used by samba. Now we have all ports of samba

firewall-cmd --zone=linuxtopic --add-port=137/tcp --permanent
firewall-cmd --zone=linuxtopic --add-port=138/udp --permanent

firewall-cmd --zone=linuxtopic --add-port=139/tcp --permanent
firewall-cmd --zone=linuxtopic --add-port=445/tcp --permanent

firewall-cmd --reload

Thanks