I remember way back, I had two machines with firewire ports, you could
plug a passive lead between them and each would see an 800Mbps NIC, this
was years before any machine I owned had a 1Gbps ethernet port.
So now if you plug a USB4 cable between two machines with TB4 ports, why can't they both show a 40Gbps NIC?
Andy Burns wrote:
if you plug a USB4 cable between two machines with TB4 ports, why
can't they both show a 40Gbps NIC?
Maybe you need a specific TB4 not USB4 cable?
I remember way back, I had two machines with firewire ports, you could
plug a passive lead between them and each would see an 800Mbps NIC, this
was years before any machine I owned had a 1Gbps ethernet port.
So now if you plug a USB4 cable between two machines with TB4 ports, why can't they both show a 40Gbps NIC?
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.
Perhaps you need to create the interface? Go to Settings/Network and
Add, Thunderbolt Bridge.
When you plug in the Thunderbolt cable that may
also give you a Thunderbolt Ethernet (Slot 0 or 1 in my case).
If it doesn't, Add again and see if it's in there.both laptops have two thunderbolt ports, normally one laptop is
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 :-(
Andy Burns wrote:
I've seen videos of it being demoed mac->pc with talk of pc->pc, and I
have no doubt it works mac->mac
It does exist pc->pc, or at least did. https://www.reddit.com/r/Thunderbolt/comments/yae2bv/ethernetoverthunderbolt_connection_between/
Each end shows up as a 20Gbps ethernet NIC to the other, just using
APIPA addresses, windows file sharing on a 9.8GB zip file gets about
620MB/s (so about 5Gbps)
I tried bumping up jumbo frames to 64kB but that made it slower, will
see what it can do with iperf tomorrow ...
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