Thanks, I'm with you thus far. But how can I know what the pointer is supposed to point to?

Here are all the valid options:

typedef enum{
ESP_NETIF_SUBNET_MASK = 1, /**< Network mask */
ESP_NETIF_DOMAIN_NAME_SERVER = 6, /**< Domain name server */
ESP_NETIF_ROUTER_SOLICITATION_ADDRESS = 32 ...

I have installed using git recursive. and ran ./install esp32
when i createed a new project and ran idf.py menuconfig i could not find esp32-specific settings here.

Was is removed?