166 | Aprisa LTE User Manual
8. Set ‘TTL = 255’ for max hop count and MTU to any max MTU required size (recommended 1500 byte).
Note that the MTU must be lower than the operator ‘Cellular MTU’ shown in Cellular > Summary
page.
9. Set ‘Source Interface’ = wwan. If all traffic is directed via this interface and public IP address might
change, it is recommended to set the source interface only and leave the source/destination public
address with default value 0.0.0.0 to eliminate the tunnel disconnection on public IP change.