diff --git a/src/client.rs b/src/client.rs
index 1ad99ae..190602f 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -24,7 +24,7 @@ pub async fn client_mode(client_config: ClientConfiguration, fd: i32) {
     sock.connect(&client_config.server.endpoint).await.unwrap();
 
     let mut config = tun2::Configuration::default();
-    config.raw_fd(fd);
+    config.raw_fd(fd).up();
 
     let dev = tun2::create(&config).unwrap();
     let (mut dev_reader, mut dev_writer) = dev.split();