In RFC 793, is this statement (Section 3.4, Figure 10 for Half-Open Connection Discovery) a MUST or a SHOULD?
"When the SYN arrives at line 3, TCP B, being in a synchronized state, and the incoming segment outside the window, responds with an acknowledgment indicating what sequence it next expects to hear (ACK 100)." In other words, if TCP B does not send back the ACK, does it violate RFC 793? For Half-Open Discovery, is sending back ACK upon receiving SYN the only option, or are there other acceptable behaviors? Thanks, Nam Nguyen
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