CONFIG_LWIP_PPP_SUPPORT=y
CONFIG_LWIP_PPP_PAP_SUPPORT=y
CONFIG_LWIP_TCPIP_TASK_STACK_SIZE=4096
CONFIG_LWIP_PPP_ENABLE_IPV6=n
CONFIG_UART_ISR_IN_IRAM=y
# Enable NAPT
CONFIG_LWIP_IP_FORWARD=y
CONFIG_LWIP_IPV4_NAPT=y