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package main
import (
"fmt"
"net"
"time"
)
// The host we will try to connect to.
// ipv6.google.com is a good choice as it's highly available and resolves only to AAAA records (IPv6).
const ipv6TestHost = "ipv6.google.com"
const testPort = "443" // HTTPS port, almost always open.
func IPv6test() (string, error) {
// We use net.DialTimeout to attempt a TCP connection.
// By specifying "tcp6" as the network, we force the dialer to use IPv6 only.
// If the system can't resolve the AAAA record or can't route to the IPv6 address,
// this will fail.
timeout := 2 * time.Second
conn, err := net.DialTimeout("tcp6", net.JoinHostPort(ipv6TestHost, testPort), timeout)
// Check the result.
if err != nil {
// The connection failed. This indicates that IPv6 is not working correctly.
return fmt.Sprintf("IPv6 connectivity test failed: %v"), err
}
// If we get here, the connection was successful.
// It's good practice to close the connection we opened.
conn.Close()
return fmt.Sprintf("IPv6 connectivity test successful."), nil
}
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