Re: tap interface detached

[Frédéric Fauberteau <frederic%fauberteau.org@localhost>]

Robert Swindells wrote:
> Frédéric Fauberteau <frederic%fauberteau.org@localhost> wrote:
> > I am trying to install a Xen domU and I am reproducing a working
> > configuration for NetBSD 9.0 amd64 from a running host.
> >
> > I create a tunnel interface:
> >
> >      # ifconfig tap0 create
> >      # ifconfig tap0 inet 192.168.0.1 up
> >
> > I add this interface to a bridge:
> >
> >      # ifconfig bridge0 create
> >      # brconfig bridge0 add tap0 up
> >
> > The tap interface appears to be detached:
>
> You need to add something else to the bridge that has a carrier signal,
> the simplest configuration would be to add the outgoing interface of the
> dom0.

Yes, I created the domU and a virtual interface had been added to the 
bridge:

    # brconfig bridge0
    bridge0: flags=41<UP,RUNNING>
            Configuration:
                    priority 32768 hellotime 2 fwddelay 15 maxage 20
                    ipfilter disabled flags 0x0
            Interfaces:
                    xvif1i0 flags=3<LEARNING,DISCOVER>
                            port 6 priority 128
                    tap0 flags=3<LEARNING,DISCOVER>
                            port 4 priority 128
            Address cache (max cache: 100, timeout: 1200):
                    00:16:3e:26:13:02 xvif1i0 1182 flags=0<>

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
            inet6 fe80::f00b:a4ff:fefb:2275%tap0/64 flags 0x8<DETACHED> 
scopeid 0x4
            inet6 2001:bc8:3807:101::1/64 flags 0x8<DETACHED>
            inet 192.168.0.1/24 broadcast 192.168.0.255 flags 0x4<DETACHED>