Using default in ALT distributins 'ip' utils instead of ifconfig one.

--- ./src/device-linux.C

+++ ./src/device-linux.C

@@ -70,7 +70,7 @@ tap_device::info ()

 const char *

 tap_device::if_up ()

 {

-  return "/sbin/ifconfig $IFNAME hw ether $MAC mtu $MTU";

+  return "/sbin/ip link set $IFNAME up address $MAC mtu $MTU";

 }

 tap_device::tap_device ()