diff --git a/lib/tun2/server.go b/lib/tun2/server.go
index a43ca63..f8f8cae 100644
--- a/lib/tun2/server.go
+++ b/lib/tun2/server.go
@@ -79,6 +79,9 @@ func NewServer(cfg *ServerConfig) (*Server, error) {
 		cfg.SmuxConf = smux.DefaultConfig()
 	}
 
+	cfg.SmuxConf.KeepAliveInterval = time.Second
+	cfg.SmuxConf.KeepAliveTimeout = 15 * time.Second
+
 	server := &Server{
 		cfg: cfg,