- Close/disconnect:
- Disconnect a TCP connection = closing your (uni-directional) TCP connection
- Assumption:
- The client
initiates the
disconnect
(The protocol is identical for the server)
- The client
initiates the
disconnect
- The messages
that are exchanged
during the TCP disconnection protocol
- The
client
sends a FIN(seq no) request to
the server:
- When the
server
receives the FIN request,
it deletes (invalidates) the
ACK no
state variable:
Then the server will acknowledges the FIN message:
- When the
client
receives/processes the ACK reply
of the server:
The client will:
- Delete (invalidate) its own
send seqn no
- The client
can no longer
transmit message
to the server !!!
(because a message needs to use a valid send sequence number !!!)
- The client
can no longer
transmit message
to the server !!!
- Delete (invalidate) its own
send seqn no
- The
client
sends a FIN(seq no) request to
the server:
-
Note:
- The reverse TCP connection
is still open:
The server has a valid sequence number !!!
The client can verify and acknowledge !!!!
- We call
such a TCP connection:
- half closed .....
- The reverse TCP connection
is still open: