Zephyr net config

[EIEI]

HI，
   In the Zephyr config, these【NET_IPV6_NBR_CACHE & NET_IPV6_ND】 are recommended to be enabled by default. Why does the Bulb project turn these off, and what impact will it have if they are turned off?

[Marte Myrvold]

Hi,

These configurations are disabled when using Matter over Thread, as you can see here: https://github.com/nrfconnect/sdk-connectedhomeip/blob/b16d42678846cacd5ef9cadd01ceab00e2119bf6/config/nrfconnect/chip-module/Kconfig.defaults#L112.

As stated in your picture, the config enables IPv6 neighbor cache. This is used for Ethernet and Wi-Fi, while Thread uses its own mechanism to handle neighbors, so the standard IPv6 neighbor cache mechanism is unnecessary when using Matter over Thread.

Best regards,
Marte