Network Quality

TCP handshake delay check

Establishes a TCP connection, records the handshake time, and immediately disconnects. It does not involve application layer protocols, making it suitable for testing network latency of Layer 4 services such as game gateways and databases.

 python3 -c "
import socket
import time
host = 'api.example.com'
port = 3250
print(f'Testing TCP handshake latency for {host}:{port}...')
while True:
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.settimeout(2)  # Set 2-second timeout
        start = time.time()
        s.connect((host, port))
        latency = (time.time() - start) * 1000
        print(f'Connection successful: Latency {latency:.2f} ms')
        s.close()
    except Exception as e:
        print(f'Connection failed: {e}')
    time.sleep(1)
"

Expected output

Testing TCP handshake latency for {host}:{port}...
Connection successful: latency 45.12 ms
Connection successful: Latency 44.80 ms
Connection successful: Latency 46.01 ms
...