Zephyr TCP/IPv4 replies to packets with source IP address set to 255.255.255.255 broadcast address. It replies to: - ICMP echo request - UDP - TCP All these packets should be dropped instead. [ipv4-bcast-src.pcapng.gz](https://github.com/zephyrproject-rtos/zephyr/files/2505294/ipv4-bcast-src.pcapng.gz)