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I am exporting a few items over NFS, but my clients can't mount them. When I try to showmount -e myServer I get 

clnt_create: RPC: Port mapper failure - Unable to receive: errno 113 (No route to host)

A bit of digging shows that this could be due to my firewall. Indeed, firewall-cmd --list-all shows:

public (default, active)
  interfaces: enp0s25 enp3s0
  sources: 
  services: dhcpv6-client ssh
  ports: 
  masquerade: no
  forward-ports: 
  icmp-blocks: 
  rich rules:

Now, it is only on the enp3s0 interface that I want to have these connections on, and I know this is an internal network. As such, I think I can completely take down the firewall on this interface, but I have two questions:

(1) Is this correct? Can I completely take down the firewall for this interface to fix the NFS mounting issue on this internal network? (2) How would I take down the firewall for only this interface so that it stays persistent between reboots?

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According to firewalld manual 

firewall-cmd --permanent --zone=trusted --change-interface=enp3s0

must allow all connections on interface.

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