KEP-Software : Information about protocol 'TCP'

Explanation of colors

Queried object
Refers to a base object, e.g. a base protocol or interface.
Refers to a child of the object.
Refers to a dependency. If it changes then this might be impacted as well.
This is an extra visible attribute of the object.
The given object refers to this object. Referrals are only of the main object.

			TCP
description				TCP - Protocol description.
protocol			IP	IP - Protocol description.
	abbreviation		IP	Internet Protcol
	version		IPv4
	version		IPv6
abbreviation			TCP	Transmission Control Protocol
section			Header Format
	document		RFC-793	Section 3.1
	ascii		Header Layout	0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ \| Source Port \| Destination Port \| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ \| Sequence Number \| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ \| Acknowledgment Number \| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ \| Data \| \|U\|A\|P\|R\|S\|F\| \| \| Offset\| Reserved \|R\|C\|S\|S\|Y\|I\| Window \| \| \| \|G\|K\|H\|T\|N\|N\| \| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ \| Checksum \| Urgent Pointer \| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ \| Options \| Padding \| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ \| data \| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	bits16		Source Port	The source port number.
	bits16		Destination Port	The destination port number.
	bits32		Sequence Number	The sequence number of the first data octet in this segment (except when SYN is present). If SYN is present the sequence number is the initial sequence number (ISN) and the first data octet is ISN+1.
	bits32		Ack Number	If the ACK control bit is set this field contains the value of the next sequence number the sender of the segment is expecting to receive. Once a connection is established this is always sent.
	bits4		Data Offset	The number of 32 bit words in the TCP Header. This indicates where the data begins. The TCP header (even one including options) is an integral number of 32 bits long.
	bits6		Reserved	Reserved for future use. Must be zero.
	section		Control Bits	6 bits (from left to right)
		bit	URG	Urgent Pointer field significant
		bit	ACK	Acknowledgment field significant
		bit	PSH	Push Function
		bit	RST	Reset the connection
		bit	SYN	Synchronize sequence numbers
		bit	FIN	No more data from sender
	bits16		Window	The number of data octets beginning with the one indicated in the acknowledgment field which the sender of this segment is willing to accept.
	bits16		Checksum	The checksum field is the 16 bit one's complement of the one's complement sum of all 16 bit words in the header and text.
	bits16		Urgent Pointer	This field communicates the current value of the urgent pointer as a positive offset from the sequence number in this segment. The urgent pointer points to the sequence number of the octet following the urgent data. This field is only be interpreted in segments with the URG control bit set.
	bits24		Options	Variable length. Options may occupy space at the end of the TCP header and are a multiple of 8 bits in length. All options are included in the checksum. See spec.
	bits8		Padding	Variable Length. The TCP header padding is used to ensure that the TCP header ends and data begins on a 32 bit boundary. The padding is composed of zeros.
section			Messages	Messages used for the msg flow
	message		ACK	Acknowledgment
	message		SYN	Synchronize sequence numbers
	message		SYN+ACK	An accepted synchronization or connetion.
	message		DATA	Used to denote data being transmittednothing (no ack).
	message		DATA+ACK	Used to denote data with implicit ack.
	message		RST	Reset the connection
	message		FIN	No more data from sender
	message		FIN+ACK	The FINished msg to tell the connection is being closed.
specification			RFC-793	Transmission Control Protocol
protocol			FTP	FTP - Protocol description.
	abbreviation		FTP	File Transfer Protocol
	section		req supported	The supported request by the FTP daemon
		message	ABOR	abort previous command
		message	ACCT	specify account (ignored)
		message	ADAT	send an authentication protocol message
		message	ALLO	allocate storage (vacuously)
		message	APPE	append to a file
		message	AUTH	specify an authentication protocol to be performed
		message	CCC	set the command channel protection mode to 'Clear' (no protection). Only available if the -c command-line option was given.
		message	CDUP	change to parent of current working directory
		message	CWD	change working directory
		message	DELE	delete a file
		message	ENC	send a privacy and integrity protected command (given in argument)
		message	HELP	give help information
		message	LIST	give list files in a directory (''ls -lgA'')
		message	MIC	send an integrity protected command (given in argument)
		message	MKD	make a directory
		message	MDTM	show last modification time of file
		message	MODE	specify data transfer mode
		message	NLST	give name list of files in directory
		message	NOOP	do nothing
		message	PASS	specify password
		message	PASV	prepare for server-to-server transfer
		message	PBSZ	specify a protection buffer size
		message	PORT	specify data connection port
		message	PROT	specify a protection level under which to protect data transfers
		message	PWD	print the current working directory
		message	QUIT	terminate session
		message	REST	restart incomplete transfer
		message	RETR	retrieve a file
		message	RMD	remove a directory
		message	RNFR	specify rename-from file name
		message	RNTO	specify rename-to file name
		message	SITE	non-standard commands (see next section)
		message	SIZE	return size of file
		message	STAT	return status of server
		message	STOR	store a file
		message	STOU	store a file with a unique name
		message	STRU	specify data transfer structure
		message	SYST	show operating system type of server system
		message	TYPE	specify data transfer type
		message	USER	specify user name
	section		deprecated	Deprecated requests
		message	XCUP	change to parent of current working directory (deprecated)
		message	XCWD	change working directory (deprecated)
		message	XMKD	make a directory (deprecated)
		message	XPWD	print the current working directory (deprecated)
		message	XRMD	remove a directory (deprecated)
	section		site req	request supported by SITE request
		message	UMASK	change umask. E.g., SITE UMASK 002
		message	IDLE	set idle-timer. E.g., SITE IDLE 60
		message	CHMOD	change mode of a file. E.g., SITE CHMOD 755 filename
		message	HELP	give help information. E.g., SITE HELP

KEP-Software

Knowledge and Expertise is Powerful

Explanation of colors