TCP connection management

Posted by AJ × 08:59

• Server waits by executing LISTEN and ACCEPT primtives

• Client executes a CONNECT primitive specifying IP and PORT no, max TCP

• segment size and user data

• CONNECT sends TCP segment with SYN bit ON and ACK off

• Server can either accept or reject connection

• In call collision only one connection is established

• Connection released using FIN bit

• One FIN and one ACK in each direction

• possible to combine first ACK and second FIN in the same segment

Finite state machine

• Management on client side

• When client issue CONNECT, TCP entity sends SYN segment

• Separate state for each connection

• When ACK arrives the final ACK sent and switches to new state

• Data transfer

• when no data issue CLOSE primitive sends FIN segment

• One side goes to WAIT and waits for the FIN from other side

• Packet life time taken care too

• Management on server side

• When server issue LISTEN and waits for incoming request

• When SYN comes the server responds with ACK

• When three way handshake complete then server goes to new state

• FIN is sent when server want to close

All Syllabus