Wired Ethernet connection Sony A9

Hello I am trying to set up a Sony A9 to send to an iPhone using a lighting to ethernet adapter and a short patch cable. I have successfully done this with a Nikon D500.
I did it much the way rmackson described it in this post: viewtopic.php?f=16&t=2437
The issue I see to be having is that when you manually set the IP address of the camera on the A9 you need to enter a default gateway. On the D500 the gateway option is not enabled
I have the IP address of the phone set to 10.0.0.1 with a subnet mask of 255.255.0.0
The camera's IP address I have set to 10.0.0.2 with a subnet mask of 255.255.0.0
My question is what do I set the default gateway to?
Thanks in advance for your help.
I did it much the way rmackson described it in this post: viewtopic.php?f=16&t=2437
The issue I see to be having is that when you manually set the IP address of the camera on the A9 you need to enter a default gateway. On the D500 the gateway option is not enabled
I have the IP address of the phone set to 10.0.0.1 with a subnet mask of 255.255.0.0
The camera's IP address I have set to 10.0.0.2 with a subnet mask of 255.255.0.0
My question is what do I set the default gateway to?
Thanks in advance for your help.