The Nomadic mode edits the MTU, comparing it to the configured one on the Radio channel and decreasing this configured value by its 46B overhead. E.g. for the configured 1500B MTU, the actual MTU drops to 1454 Bytes.
The RSS ping works even in the Nomadic mode but does not display the measured RSS/DQ values. It does not display the current path because each packet is encapsulated into the tunnel.
Nomadic mode in relation to other RipEX services is described in RipEX Manual.