====== IP pass-through ======
With IP pass through a connected device can be adressed directly with a public static WAN-IP address.

IP pass-through creates a subnet for the attached device (/29) including WAN-IP - and gateway address. 

Problem: In order that the used IP's are still reachable in the APN network, a smaller network (== more hosts per network) must be configured:

Example:
IP received from your APN: 10.203.1.2/17

Network:    10.203.0.0/17\\         
HostMin: 	10.203.0.1 \\	
HostMax: 	10.203.127.254\\ 


Without configured optional WAN network/ WAN netmask the connected device receives:
10.203.1.2/29  gw 10.203.1.3.\\ The IP's 10.203.1.1 - 10.203.1.6 are no more reachable in the APN network.

Configure a smaller subnet:\\
WAN network: 10.203.0.0\\
WAN netmask: 255.255.0.0 \\ 

Network:        10.203.0.0/16 \\        	
HostMin: 	10.203.0.1 \\	
HostMax: 	10.203.255.254 \\


The device receives: 10.203.1.2/16 gw 10.203.128.0

The gateway is outside of the APN network but the hosts are still reachable