fix nat64 and refactor ipv6

src/client.rs

@@ -376,7 +376,7 @@ impl Client {
         log::info!("peer address: {}, timeout: {}", peer, connect_timeout);
         let start = std::time::Instant::now();
         // NOTICE: Socks5 is be used event in intranet. Which may be not a good way.
-        let mut conn = socket_client::connect_tcp_local(peer, local_addr, connect_timeout).await;
+        let mut conn = socket_client::connect_tcp_local(peer, Some(local_addr), connect_timeout).await;
         let mut direct = !conn.is_err();
         if interface.is_force_relay() || conn.is_err() {
             if !relay_server.is_empty() {