rfc793_SEGMENT_ARRIVES_elided.txt		rfc793bis_section_3.10.7.4_original_elided.txt
	Otherwise,		Otherwise,
	first check sequence number		first check sequence number
	SYN-RECEIVED STATE		- SYN-RECEIVED STATE
	ESTABLISHED STATE		ESTABLISHED STATE
	FIN-WAIT-1 STATE		FIN-WAIT-1 STATE
	FIN-WAIT-2 STATE		FIN-WAIT-2 STATE
	CLOSE-WAIT STATE		CLOSE-WAIT STATE
	CLOSING STATE		CLOSING STATE
	LAST-ACK STATE		LAST-ACK STATE
	TIME-WAIT STATE		TIME-WAIT STATE
	Segments are processed in sequence. Initial tests ...		o Segments are processed in sequence. Initial tests ...
	<new text in bis>		o In general, the processing of received segments MUST ...
	There are four cases for the acceptability test for ...		o There are four cases for the acceptability test for ...
	Segment Receive Test		Segment Receive Test
	Length Window		Length Window
	------- ------- ------------------------------------ ...		------- ------- ------------------------------------ ...
	<new text in bis>		o In implementing sequence number validation as described ...
	If the RCV.WND is zero, no segments will be acceptable, ...		o If the RCV.WND is zero, no segments will be acceptable, ...
	If an incoming segment is not acceptable, an ...		o If an incoming segment is not acceptable, an ...
	<SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK>		+ <SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK>
	After sending the acknowledgment, drop the unacceptable ...		o After sending the acknowledgment, drop the unacceptable ...
	<new text in bis>		o Note that for the TIME-WAIT state, there is an improved ...
	In the following it is assumed that the segment is the ...		o In the following it is assumed that the segment is the ...
	second check the RST bit,		- second check the RST bit,
	<new text in bis>		o RFC 5961 [9] section 3 describes a potential blind reset ...
	<new text in bis>		+ 1) If the RST bit is set and the sequence number is ...
	<new text in bis>		+ 2) If the RST bit is set and the sequence number exactly ...
	<new text in bis>		+ 3) If the RST bit is set and the sequence number does not ...
	<new text in bis>		<SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK>
	<new text in bis>		After sending the challenge ACK, TCP endpoints MUST ...
	SYN-RECEIVED STATE		o SYN-RECEIVED STATE
	If the RST bit is set		+ If the RST bit is set
	If this connection was initiated with a passive ...		* If this connection was initiated with a passive ...
	ESTABLISHED		o ESTABLISHED
	FIN-WAIT-1		FIN-WAIT-1
	FIN-WAIT-2		FIN-WAIT-2
	CLOSE-WAIT		CLOSE-WAIT
	If the RST bit is set then, any outstanding RECEIVEs ...		+ If the RST bit is set then, any outstanding RECEIVEs ...
	CLOSING STATE		o CLOSING STATE
	LAST-ACK STATE		LAST-ACK STATE
	TIME-WAIT		TIME-WAIT
	If the RST bit is set then, enter the CLOSED state ...		+ If the RST bit is set then, enter the CLOSED state ...
	third check security and precedence		- third check security
	SYN-RECEIVED		o SYN-RECEIVED
	If the security/compartment and precedence in the segment do not ...		+ If the security/compartment in the segment does not ...
	ESTABLISHED STATE		o ESTABLISHED
	<new text in bis>		FIN-WAIT-1
	<new text in bis>		FIN-WAIT-2
	<new text in bis>		CLOSE-WAIT
	<new text in bis>		CLOSING
	<new text in bis>		LAST-ACK
	<new text in bis>		TIME-WAIT
	If the security/compartment and precedence in the segment do not ...		+ If the security/compartment in the segment does not ...
	Note this check is placed following the sequence check ...		o Note this check is placed following the sequence check ...
	fourth, check the SYN bit,		- fourth, check the SYN bit,
	SYN-RECEIVED		o SYN-RECEIVED
	<new text in bis>		+ If the connection was initiated with a passive OPEN ...
	ESTABLISHED STATE		ESTABLISHED STATE
	FIN-WAIT STATE-1		FIN-WAIT STATE-1
	FIN-WAIT STATE-2		FIN-WAIT STATE-2
	CLOSE-WAIT STATE		CLOSE-WAIT STATE
	CLOSING STATE		CLOSING STATE
	LAST-ACK STATE		LAST-ACK STATE
	TIME-WAIT STATE		TIME-WAIT STATE
	If the SYN is in the window it is an error, ...		+ If the SYN bit is set in these synchronized states ...
	<new text in bis>		+ <SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK>
	<new text in bis>		+ After sending the acknowledgement, TCP implementations ...
	<new text in bis>		+ For implementations that do not follow RFC 5961 ...
	If the SYN is not in the window this step would ...		+ If the SYN is not in the window this step would ...
	fifth check the ACK field,		- fifth check the ACK field,
	if the ACK bit is off drop the segment and return		o if the ACK bit is off drop the segment and return
	if the ACK bit is on		o if the ACK bit is on
	<new text in bis>		+ RFC 5961 [9] section 5 describes a potential blind data ...
	SYN-RECEIVED STATE		+ SYN-RECEIVED STATE
	If SND.UNA =< SEG.ACK =< SND.NXT then enter ESTABLISHED ...		* If SND.UNA < SEG.ACK =< SND.NXT then enter ESTABLISHED ...
	<new text in bis>		- SND.WND <- SEG.WND
	<new text in bis>		SND.WL1 <- SEG.SEQ
	<new text in bis>		SND.WL2 <- SEG.ACK
	If the segment acknowledgment is not acceptable, form ...		* If the segment acknowledgment is not acceptable, form ...
	<SEQ=SEG.ACK><CTL=RST>		- <SEQ=SEG.ACK><CTL=RST>
	and send it.		* and send it.
	ESTABLISHED STATE		+ ESTABLISHED STATE
	If SND.UNA < SEG.ACK =< SND.NXT then, set SND.UNA ...		* If SND.UNA < SEG.ACK =< SND.NXT then, set SND.UNA ...
	If SND.UNA < SEG.ACK =< SND.NXT, the send window ...		* If SND.UNA =< SEG.ACK =< SND.NXT, the send window ...
	Note that SND.WND is an offset from SND.UNA, ...		* Note that SND.WND is an offset from SND.UNA, ...
	FIN-WAIT-1 STATE		+ FIN-WAIT-1 STATE
	In addition to the processing for the ESTABLISHED ...		* In addition to the processing for the ESTABLISHED ...
	FIN-WAIT-2 STATE		+ FIN-WAIT-2 STATE
	In addition to the processing for the ESTABLISHED ...		* In addition to the processing for the ESTABLISHED ...
	CLOSE-WAIT STATE		+ CLOSE-WAIT STATE
	Do the same processing as for the ESTABLISHED state.		* Do the same processing as for the ESTABLISHED state.
	CLOSING STATE		+ CLOSING STATE
	In addition to the processing for the ESTABLISHED ...		* In addition to the processing for the ESTABLISHED ...
	LAST-ACK STATE		+ LAST-ACK STATE
	The only thing that can arrive in this state is ...		* The only thing that can arrive in this state is ...
	TIME-WAIT STATE		+ TIME-WAIT STATE
	The only thing that can arrive in this state is ...		* The only thing that can arrive in this state is ...
	sixth, check the URG bit,		- sixth, check the URG bit,
	ESTABLISHED STATE		o ESTABLISHED STATE
	FIN-WAIT-1 STATE		FIN-WAIT-1 STATE
	FIN-WAIT-2 STATE		FIN-WAIT-2 STATE
	If the URG bit is set, RCV.UP <- max(RCV.UP,SEG.UP) ...		+ If the URG bit is set, RCV.UP <- max(RCV.UP,SEG.UP) ...
	CLOSE-WAIT STATE		o CLOSE-WAIT STATE
	CLOSING STATE		CLOSING STATE
	LAST-ACK STATE		LAST-ACK STATE
	TIME-WAIT		TIME-WAIT
	This should not occur, since a FIN has been received ...		+ This should not occur, since a FIN has been received ...
	seventh, process the segment text,		- seventh, process the segment text,
	ESTABLISHED STATE		o ESTABLISHED STATE
	FIN-WAIT-1 STATE		FIN-WAIT-1 STATE
	FIN-WAIT-2 STATE		FIN-WAIT-2 STATE
	Once in the ESTABLISHED state, it is possible to ...		+ Once in the ESTABLISHED state, it is possible to ...
	When the TCP takes responsibility for ...		+ When the TCP endpoint takes responsibility for ...
	Once the TCP takes responsibility for ...		+ Once the TCP endpoint takes responsibility for ...
	<new text in bis>		+ A TCP implementation MAY send an ACK segment ...
	Please note the window management suggestions in ...		+ Please note the window management suggestions in ...
	Send an acknowledgment of the form:		+ Send an acknowledgment of the form:
	<SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK>		* <SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK>
	This acknowledgment should be piggybacked on a ...		+ This acknowledgment should be piggybacked on a ...
	CLOSE-WAIT STATE		o CLOSE-WAIT STATE
	CLOSING STATE		CLOSING STATE
	LAST-ACK STATE		LAST-ACK STATE
	TIME-WAIT STATE		TIME-WAIT STATE
	This should not occur, since a FIN has been received ...		+ This should not occur, since a FIN has been received ...
	eighth, check the FIN bit,		- eighth, check the FIN bit,
	Do not process the FIN if the state is CLOSED, LISTEN ...		o Do not process the FIN if the state is CLOSED, LISTEN ...
	If the FIN bit is set, signal the user "connection ...		o If the FIN bit is set, signal the user "connection ...
	SYN-RECEIVED STATE		+ SYN-RECEIVED STATE
	ESTABLISHED STATE		ESTABLISHED STATE
	Enter the CLOSE-WAIT state.		* Enter the CLOSE-WAIT state.
	FIN-WAIT-1 STATE		+ FIN-WAIT-1 STATE
	If our FIN has been ACKed (perhaps in this ...		* If our FIN has been ACKed (perhaps in this ...
	FIN-WAIT-2 STATE		+ FIN-WAIT-2 STATE
	Enter the TIME-WAIT state. Start the time-wait ...		* Enter the TIME-WAIT state. Start the time-wait ...
	CLOSE-WAIT STATE		+ CLOSE-WAIT STATE
	Remain in the CLOSE-WAIT state.		* Remain in the CLOSE-WAIT state.
	CLOSING STATE		+ CLOSING STATE
	Remain in the CLOSING state.		* Remain in the CLOSING state.
	LAST-ACK STATE		+ LAST-ACK STATE
	Remain in the LAST-ACK state.		* Remain in the LAST-ACK state.
	TIME-WAIT STATE		+ TIME-WAIT STATE
	Remain in the TIME-WAIT state. Restart the 2 MSL ...		* Remain in the TIME-WAIT state. Restart the 2 MSL ...
	and return.		- and return.
End of changes. 134 change blocks.
	135 lines changed or deleted		135 lines changed or added
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