There are two modes: static mode and the DHCP mode.
The IP/submask/gateway are null when you select the
DHCP mode to auto search the IP.
If you select the static mode, you need to set the
IP/submask/gateway manually.
If you select the DHCP mode, you can view the
IP/submask/gateway from the DHCP.
If you switch from the DHCP mode to the static mode, you
need to reset the IP parameters.