diff --git a/lower/tun_linux.go b/lower/tun_linux.go
index 8a953ea..045576d 100644
--- a/lower/tun_linux.go
+++ b/lower/tun_linux.go
@@ -6,6 +6,7 @@ package lower
 func (n *NIC) prepare() {
 	execute("/sbin/ip", "link", "set", "dev", n.ifce.Name(), "mtu", "1500")
 	execute("/sbin/ip", "addr", "add", n.ip, "dev", n.ifce.Name())
+	execute("/sbin/ip", "link", "set", "dev", n.ifce.Name(), "up")
 	execute("/sbin/ip", "route", "add", n.subnet, "dev", n.ifce.Name())
 }