When you access the NFS server using v4 of the protocol on both the client and server, the firewall configuration is quite simple with only the TCP port
2049 required to be opened. The default firewall daemon on RHEL 7 is
firewalld and is managed from the command line using
We have been running the standard firewall for our demonstrations thus far just opening the one additional port
2049, as detailed in the lab overview earlier in this section.
We can list the current firewall configuration using the following command:
$ sudo firewall-cmd --list-all
The output is shown in the following screenshot: