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參數資料
型號: W3100A
廠商: Electronic Theatre Controls, Inc.
英文描述: i2Chip W3100A
中文描述: i2Chip W3100A
文件頁數: 27/63頁
文件大小: 557K
代理商: W3100A
CLOSED
INIT
LISTEN
SYNRCVD
ESTABLISHED
cmd : sys_init,
close
cmd : sock_init
cmd : listen
recv : SYN
send : SYN, ACK
recv : ACK
Timeout
starting point
recv : RST
a. CLOSED state: channel is initialized by executing sys_init or close command
b. INIT state: sets the port number (source port register) to be used in the channel and activates the channel
by executing the sock_init command
c. LISTEN state: stands by for connection set-up from the peer. When SYN packet for the corresponding
port is received from the peer, SYN,ACK packet is transmitted and changes to SYNRCVD state.
d. SYNRCVD state: SYN,ACK packet is transmitted and stands by for ACK from the peer. When reply
from the peer is received, it changes to ESTABLISHED state, and when no reply is received, SYN,ACK
Packet is re-transmitted and changes to CLOSED state upon occurrence of timeout or receipt of RST packet.
TCP Connection Termination Process
In line with the connection set-up process, TCP connection termination process also uses three-way
handshaking method.
Sending FIN after receiving Close command from the application is called active close, and closing after
receiving FIN from the peer is called passive close.
ESTABLISHED
CLOSE_WAIT
cmd : close
send : FIN
LAST_ACK
recv : ACK
FIN_WAIT1
FIN_WAIT2
CLOSING
TIME_WAIT
recv : FIN
send : ACK
CLOSED
cmd : close
send : FIN
recv : ACK
recv : FIN
send : ACK
recv : FIN
send : ACK
recv : ACK
recv : FIN, ACK
send : ACK
active close
passive close
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