Restrict client access to NFS export

Hi all,

I am new to the Isilon world and I am running into a problem when I want to configure the client server for the NFS export.

The case is the following, I understand that if you do not specify any client in the export configuration, you allow the entire network to access that export, correct?

Well, I want to test if this is true, I have several Linux servers with IPs: 192.168.1.40, 192.168.1.41 and 192.168.1.42.
I create an NFS export and in the "Clients" text box I put the first IP: 192.168.1.40.
According to this, the export could only mount and access that IP, right? So why can the other two IPs mount and access it too?

I don't understand why it is not restricting access to the other two IPs ...

Could someone help me with this?

Regards.