Hello,
I am following this (https://www.keil.com/pack/doc/mw/Network/html/network_create_app.html#Runtime%20Configuration) tutorial about the Network library with CMSIS. I could change the Mac address via " netIF_SetOption (NET_IF_CLASS_ETH | 0, netIF_OptionMAC_Address, buf, NET_ADDR_ETH_LEN);" without any problem but by using the