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A RST/ACK can only be matched to a SYN or FIN. A bare RST cannot be matched to a SYN or FIN. Matthew Stickney and Joe McEachern found cases where this caused replies to be missed (specifically, RST/ACK in reponse to a NULL probe) and also found standards justification for hosts returning RST/ACK in such a situation.
226 KiB
226 KiB