Jaimie Vandenbergh wrote:
> Andy Burns wrote:
>
>> if you plug a USB4 cable between two machines with TB4 ports, why
>> can't they both show a 40Gbps NIC?
>
> Works at 20Gbps between two Macs with TB3 ports, with full Thunderbolt
> cable.
I've seen videos of it being demoed mac->pc with talk of pc->pc, and I
have no doubt it works mac->mac
> Perhaps you need to create the interface? Go to Settings/Network and
> Add, Thunderbolt Bridge.
I think the thunderbolt bridge is a mac-only thing.
> When you plug in the Thunderbolt cable that may
> also give you a Thunderbolt Ethernet (Slot 0 or 1 in my case).
No additional NIC devices appear in Device Manager when connecting the
two laptops via TB4 cable, no extra USB4 endpoints appear on the
> If it doesn't, Add again and see if it's in there.
both laptops have two thunderbolt ports, normally one laptop is
connected to a TB4 dock, and the other port unused
the second laptop normally is just powered over one port and the other
used for occasional USB devices (though it does work as thunderbolt if
plugged to the same dock as above)
have tried undocking laptop so the only ports in use are between the two
laptops with a cable.
Discovered there is a utility called "Thunderbolt Control Centre" in the
Windows store, which has some sort of role in authenticating devices
(presumably to prevent the remote-DMA type attacks from firewire days?)
it shows both ports, but no devices that it can authenticate.
I think I've got a spare thunderbolt downstream port on the dock, might
try the second laptop into that, but seems a bit unlikely it'd work that
way when direct port->port doesn't.
Very little seems to be talked about thunderbolt networking, apart from
physical ethernet dongles, by the laptop manufacturers or microsoft :-(