TCP scenarios
Three-way handshaking.
Active open (client connect
s)
Step 1: connect()
sends SYN
, see here
Step 2: receives SYN+ACK
from server, sends ACK
.
Passive open (server accept
s)
First, call bind()
and listen()
to setup the server.
Step 1: Receives SYN
from client, sends SYN+ACK
Step 2: Receives ACK
from client
Then we can accept()
.