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First, IP level sendto doesn't give the freedom to send 25.255.255.255 out of the interface desired. So have to go link layer. Second, while python can do sendto, we have the interface index number from recvmsg (which was ctypes). python expects the name instead (wwhich it promptly turns... back into the index we start with). I could have added code to get the name using some syscalls which would have been work and produced more system calls, or added the code to directly use sendto, which would also be efficient at runtime. So I chose to use ctypes for both recvmsg and sendto here.