I have two Pepwaves connected to each other. A Pepwave MAX BR1 MK2 and a second BR1 MINI connected via Ethernet (LAN of MINI going to WAN of BR1 MK2). I have cellular SIM cards in each unit. I was told to check IP Passthrough and I did that on the Cellular connection on the BR1 MINI. I also see there is an IP Passthrough on the WAN connection on the WAN connection of the BR1 MK2 (which is the 2nd pepwave).
Where exactly am I supposed to be using IP Passthrough? The Cellular connection on the BR1 MINI and/or the WAN connection of the BR1 MK2?