锘??xml version="1.0" encoding="utf-8" standalone="yes"?>crdy在线观看欧美,密臀av在线播放,久久av少妇http://www.aygfsteel.com/paulwong/category/55367.htmlzh-cnTue, 29 Dec 2020 02:05:03 GMTTue, 29 Dec 2020 02:05:03 GMT60TCP 閫g窔鐙鎱嬫鍒惰垏嫻佺▼http://www.aygfsteel.com/paulwong/archive/2020/12/29/435758.htmlpaulwongpaulwongTue, 29 Dec 2020 02:04:00 GMThttp://www.aygfsteel.com/paulwong/archive/2020/12/29/435758.htmlhttp://www.aygfsteel.com/paulwong/comments/435758.htmlhttp://www.aygfsteel.com/paulwong/archive/2020/12/29/435758.html#Feedback0http://www.aygfsteel.com/paulwong/comments/commentRss/435758.htmlhttp://www.aygfsteel.com/paulwong/services/trackbacks/435758.htmlhttps://dev.twsiyuan.com/2017/09/tcp-states.html
鍦ㄩ枊鐧煎熀鏂?HTTP 鐨勭恫璺噳鐢ㄦ湇鍕欐檪錛岀暥鏈夊ぇ閲忛g窔瑕佹眰錛屾垨鏄垏闀烽g窔 (Persistent connection) 瑕佹眰鏅傦紝甯稿父閬囧埌搴曞堡 TCP 鐨勯g窔鏂風窔閷錛屽皫鑷存湇鍕欎笉絀╁畾銆傚洜姝ょ爺絀朵簡瑙?TCP 鐨勯g窔鐙鎱嬫鍒訛紝涓﹀槜瑭︾敤鑷繁鐨勬柟寮忔暣鐞嗙瓎璦橈紝甯屾湜鑳藉緸鍩虹鐭ヨ瓨涓壘鍒拌В姹洪尟瑾ょ殑綬氱儲錛屾垨鏄換浣曡兘鏇撮蹭竴姝ュ劒鍖栨湇鍕欑殑鎵嬫銆?/p>

鍍呯磤閷?TCP 閫g窔鐙鎱嬩互鍙婂緩绔嬫垨鏄柗闁嬮g窔嫻佺▼錛岄棞鏂奸蹭竴姝ョ殑 TCP 灝佸寘鍗斿畾鍙弮鑰?Reference 閫g窔銆?/p>

TCP 寤虹珛閫g窔 (Open)

閫氬父鐨?TCP 閫g窔寤虹珛嫻佺▼鑸囩媭鎱嬶紝闇瑕佷笁嬈$殑璦婃伅浜ゆ彌渚嗗緩绔嬮g窔 (three-way handshaking)錛?/p>

TCP 寤虹珛閫g窔嫻佺▼鍦? src=

TCP 寤虹珛閫g窔嫻佺▼鍦?/p>

鍏朵腑宸﹂倞閫氬父鐐?server錛屽彸閭婂墖鐐?client錛屾枃瀛楁祦紼嬫弿榪幫細

  1. Server 寤虹珛 TCB錛岄枊鍟熺洠鑱介g窔錛岄插叆鐙鎱?LISTENING
  2. Client 鐧煎嚭閫g窔瑕佹眰 SYN錛岄插叆鐙鎱?SYN-SENT錛岀瓑寰呭洖鎳?/li>
  3. Server 鏀跺埌 SYN 瑕佹眰錛屽洖鎳夐g窔鍌抽?nbsp;SYN+ACK錛屼甫閫插叆鐙鎱?SYN-RCVD (SYN-RECEIVED)
  4. Client 鏀跺埌 SYN+ACK 紕鴻獚瀹屾垚閫g窔閫插叆鐙鎱?ESTABLISHED錛屼甫閫佸嚭 ACK
  5. Server 鏀跺埌 ACK 紕鴻獚閫g窔瀹屾垚錛屼篃閫插叆鐙鎱?ESTABLISHED
  6. 闆欐柟闁嬪鍌抽佷氦鎻涜硣鏂?/li>

瑭蹭簺鍚嶈鑸囩媭鎱嬭鏄庯細

  • CLOSED錛氶g窔闂滈枆鐙鎱?/li>
  • LISTENING錛氱洠鑱界媭鎱嬶紝琚嫊絳夊緟閫g窔
  • SYN-SENT錛氫富鍕曢佸嚭閫g窔瑕佹眰 SYN錛屼甫絳夊緟灝嶆柟鍥炴噳
  • SYN-RCVD錛氭敹鍒伴g窔瑕佹眰 SYN錛岄佸嚭宸辨柟鐨?SYN+ACK 寰岋紝絳夊緟灝嶆柟鍥炴噳
  • ESTABLISHED錛氱⒑瀹氬畬鎴愰g窔錛屽彲闁嬪鍌寵幾璩囨枡
  • TCB錛歍ransmission Control Block錛宻ee wiki
  • SYN錛歋ynchronous錛岃〃紺鴻垏灝嶆柟寤虹珛閫g窔鐨勫悓姝ョ铏?/li>
  • ACK錛欰cknowledgement錛岃〃紺虹櫦閫佺殑鏁告摎宸叉敹鍒扮劇瑾?/li>

鍦ㄥ緩绔嬮g窔鏅傦紝鍙兘鏈冪櫦鐢熼洐鏂瑰悓姝ュ緩绔嬮g窔鐨勬儏褰?(Simultaneous open)錛屽父瑕嬫柤 P2P 鐨勬噳鐢ㄤ腑錛屽叾 TCP 寤虹珛閫g窔鐨勬祦紼嬩笉澶竴妯o細

TCP 鍚屾寤虹珛閫g窔嫻佺▼鍦? src=

TCP 鍚屾寤虹珛閫g窔嫻佺▼鍦?/p>

鐣垚 TCP 鐙鎱嬫祦紼嬪湒鏈冩槸閫欐ǎ錛?/p>

TCP Open 鐙鎱嬪湒

TCP Open 鐙鎱嬪湒

TCP 鏂烽枊閫g窔 (Close)

TCP 闂滈枆嫻佺▼濡備笅錛屾瘮寤虹珛閫g窔閭勮瑜囬洔涓浜涳紝闇瑕佺稉閬庡洓嬈$殑璦婃伅浜ゆ彌 (four-way handshaking)錛岃娉ㄦ剰鐨勬槸鍙互鏄敱 server 鐧艱搗涓誨嫊闂滈枆錛屾姂鎴栨槸 client 鐧艱搗涓誨嫊闂滈枆錛?/p>

TCP 闂滈枆閫g窔嫻佺▼鍦? src=

TCP 闂滈枆閫g窔嫻佺▼鍦?/p>

鍏朵腑宸﹂倞閫氬父鐐?client 鐙鎱?(鐢?client 涓誨嫊鐧艱搗闂滈枆閫g窔)錛屽彸閭婂墖鐐?server 鐙鎱嬶紝鏂囧瓧嫻佺▼鎻忚堪錛?/p>

  1. Client 婧栧倷闂滈枆閫g窔錛岀櫦鍑?nbsp;FIN錛岄插叆鐙鎱?FIN-WAIT-1
  2. Server 鏀跺埌 FIN錛岀櫦鍥炴敹鍒扮殑 ACK錛岄插叆鐙鎱?CLOSE-WAIT錛屼甫閫氱煡 App 婧栧倷鏂風窔
  3. Client 鏀跺埌 ACK錛岄插叆鐙鎱?FIN-WAIT-2錛岀瓑寰?server 鐧煎嚭 FIN
  4. Server 紕鴻獚 App 铏曠悊瀹屾柗綬氳珛姹傦紝鐧煎嚭 FIN錛屼甫閫插叆鐙鎱?LAST-ACK
  5. Client 鏀跺埌 FIN錛屼甫鍥炲偝紕鴻獚鐨?nbsp;ACK錛岄插叆鐙鎱?TIME-WAIT錛岀瓑寰呮檪闁撻亷寰屾寮忛棞闁夐g窔
  6. Server 鏀跺埌 ACK錛屼究鐩存帴闂滈枆閫g窔

瑭蹭簺鍚嶈鑸囩媭鎱嬭鏄庯細

  • ESTABLISHED錛氶g窔闁嬪暉鐙鎱?/li>
  • CLOSE-WAIT錛氱瓑寰呴g窔闂滈枆鐙鎱嬶紝絳夊緟 App 鍥炴噳
  • LAST-ACK錛氱瓑寰呴g窔闂滈枆鐙鎱嬶紝絳夊緟閬犵鍥炴噳 ACK 寰岋紝渚塊棞闁夐g窔
  • FIN-WAIT-1錛氱瓑寰呴g窔闂滈枆鐙鎱嬶紝絳夊緟閬犵鍥炴噳 ACK
  • FIN-WAIT-2錛氱瓑寰呴g窔闂滈枆鐙鎱嬶紝絳夊緟閬犵鍥炴噳 FIN
  • TIME-WAIT錛氱瓑寰呴g窔闂滈枆鐙鎱嬶紝絳夋涓孌墊檪鍊欙紝淇濊瓑閬犵鏈夋敹鍒板叾 ACK 闂滈枆閫g窔 (綞茶礬寤墮伈鍟忛)
  • CLOSED錛氶g窔闂滈枆鐙鎱?/li>
  • FIN錛氳〃紺洪棞闁夐g窔鐨勫悓姝ョ铏?/li>
  • ACK錛欰cknowledgement錛岃〃紺虹櫦閫佺殑鏁告摎宸叉敹鍒扮劇瑾?/li>

鏈夊彲鑳介g窔鐨勯洐鏂瑰悓鏅傜櫦璧烽棞闁夛紝闆栫劧姍熺巼閭勮牷浣庣殑錛?/p>

TCP 鍚屾闂滈枆閫g窔嫻佺▼鍦? src=

TCP 鍚屾闂滈枆閫g窔嫻佺▼鍦?/p>

閫欓倞澶氫竴鍊嬬媭鎱嬶細

  • CLOSING錛氱瓑寰呴g窔闂滈枆鐙鎱嬶紝絳夊緟閬犵鍥炴噳 ACK

鐣垚 TCP 鐙鎱嬫祦紼嬪湒鏈冩槸閫欐ǎ錛?/p>

TCP Close 鐙鎱嬪湒

TCP Close 鐙鎱嬪湒

鏌ヨ鐝懼湪闆昏叇鐨?TCP 鐙鎱?/h2>

鏌ヨ鐩墠鎵鏈夌殑閫g窔鐙鎱?(Windows & Linux)錛?/p>

netstat -a

Reference



paulwong 2020-12-29 10:04 鍙戣〃璇勮
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