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This option enables TCP_SAVE_SYN on the listening socket, which will cause the kernel to try to save a copy of the SYN packet header (L2, IP and TCP are supported). This can permit to check the source MAC address of a client, or find certain TCP options such as a source address encapsulated using RFC7974. It could also be used as an alternate approach to retrieving the source and destination addresses and ports. For now setting the option is enabled, but sample fetch functions and converters will be needed to extract info.
