TCP Handshake

Establish

1) A->B, Syn message include sequence number X

2) B->A, Ack with X+1 and Syn with sequence number Y 

3) A-> Ack with Y+1

 

Finsih

1) A-> B FIN  Seq=K  +ACK (seq=L)

2) B-> A ACK (seq=K+1)

3) B->A Fin (Seq =L), ACK=K+1 

4) A->B ACK = L+1