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TCP State Diagramm

Immer wieder hilfreich

RFC 793: Transmission Control Protocol - Functional Specification
siehe auch unter http://www.rfc-editor.org/rfc/rfc793.txt

                              +---------+ ---------\      active OPEN 
                              |  CLOSED |            \    ----------- 
                              +---------+<---------\   \   create TCB 
                                |     ^              \   \  snd SYN   
                   passive OPEN |     |   CLOSE        \   \          
                   ------------ |     | ----------       \   \        
                    create TCB  |     | delete TCB         \   \      
                                V     |                      \   \    
                              +---------+            CLOSE    |    \  
                              |  LISTEN |          ---------- |     | 
                              +---------+          delete TCB |     | 
                   rcv SYN      |     |     SEND              |     | 
                  -----------   |     |    -------            |     V 
 +---------+      snd SYN,ACK  /       \   snd SYN          +---------+
 |         |<-----------------           ------------------>|         |
 |   SYN   |                    rcv SYN                     |   SYN   |
 |   RCVD  |<-----------------------------------------------|   SENT  |
 |         |                    snd ACK                     |         |
 |         |------------------           -------------------|         |
 +---------+   rcv ACK of SYN  \       /  rcv SYN,ACK       +---------+
   |           --------------   |     |   -----------                 
   |                  x         |     |     snd ACK                   
   |                            V     V                               
   |  CLOSE                   +---------+                             
   | -------                  |  ESTAB  |                             
   | snd FIN                  +---------+                             
   |                   CLOSE    |     |    rcv FIN                    
   V                  -------   |     |    -------                    
 +---------+          snd FIN  /       \   snd ACK          +---------+
 |  FIN    |<-----------------           ------------------>|  CLOSE  |
 | WAIT-1  |------------------                              |   WAIT  |
 +---------+          rcv FIN  \                            +---------+
   | rcv ACK of FIN   -------   |                            CLOSE  | 
   | --------------   snd ACK   |                           ------- | 
   V        x                   V                           snd FIN V 
 +---------+                  +---------+                   +---------+
 |FINWAIT-2|                  | CLOSING |                   | LAST-ACK|
 +---------+                  +---------+                   +---------+
   |                rcv ACK of FIN |                 rcv ACK of FIN | 
   |  rcv FIN       -------------- |    Timeout=2MSL -------------- | 
   |  -------              x       V    ------------        x       V 
    \ snd ACK                 +---------+delete TCB         +---------+
     ------------------------>|TIME WAIT|------------------>| CLOSED  |
                              +---------+                   +---------+

                      TCP Connection State Diagram
                               Figure 6.