How do other Macs in the network see my Freenas 9.3 backup drive attached to iMac via Ethernet? I have a Time Machine back up setup on a Freenas 9.3 server. It works really slowly via WiFi attached to my broadband router. So, I attached it directly to my iMac via Ethernet instead - a full backup takes less than 2 hours now. Problem is how can other Macs on the network see the Freenas server through the IMac Ethernet connection via WIFI? I know the IP address of the Freenas server but can't figure out how I can Time Machine back up my Macbookair via Wifi?
Solution found:

On the iMac, we must first enable port forwarding by entering the following command in Terminal:

echo "rdr pass inet proto tcp from any to any port 12345 -&gt; 192.168.2.x port 548" | sudo pfctl -ef -


replace 192.168.2.x with whatever your FreeNAS is reporting as its IP address. You will also have to enter your account password when prompted. Now, in the Finder on your laptop, connect to your iMac's IP address (192.168.1.x) by typing command + k and entering afp://192.168.1.x:12345/. replace 192.168.1.x with whatever your iMac's IP address is, but keep :12345 as it's needed to connect to your FreeNAS. You may have to select the correct disk from a list. You should now be able to add it as a Time Machine disk on your laptop.