IFconfig command on smart phone returns both the Mobile-IP and the subnet mask (using terminal Emulator)
The UE-IP is allocated by either the HSS (S6a-ULA) or the PGW (GTPv2C Create-Session response).
However, only the IP address is present in those messages and not the subnet mask.
My question is how the UE knows about the subnet mask?
Does it obtain from the PGW?
Is the UE aware about the PGW IP address?