The sdl_nlen member will be 5 and the sdl_alen member will be 8. This requires 21 bytes, so the size is rounded up to 24 bytes (p.89 of TCPv2), assuming a 32-bit architecture.
18.2
The kernel's response is never sent to this socket. This socket option determines whether the kernel sends its reply to the sending process, as discussed on pp.649�650 of TCPv2. It defaults to ON, since most processes want replies. But, disabling the option prevents replies from being sent to the sender.
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