frederic%fauberteau.org@localhost (=?UTF-8?B?RnLDqWTDqXJpYyBGYXViZXJ0ZWF1?=) writes:
But the tap interface is still detached:
# ifconfig tap0
tap0: flags=0x8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST>
mtu 1500
ec_capabilities=0x5<VLAN_MTU,JUMBO_MTU>
ec_enabled=0x1<VLAN_MTU>
description: "Xen VM tunnel"
address: f2:0b:a4:fb:22:75
status: no carrier
^^^^^
The tap interface only gets you a carrier status when
its device side /dev/tap* is opened. It's use as virtual
ethernet is therefore limited.