From Newsgroup: comp.sys.raspberry-pi

On Sun, 13 Jul 2025 22:02:20 +0100, NY wrote:

Doesn't work when connected through USB.

Sorry I hadn't realised that connection by USB was essential and that
you couldn't alternatively use a network (Ethernet/Wifi) connection.

Don't know why the OP would insist on USB; he didn't mention what RPi he
is using. But I agree on Ethernet or WiFi, even headless (SSH).
--
s|b
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From Newsgroup: comp.sys.raspberry-pi

On 14/07/2025 13:49, s|b wrote:

On Sun, 13 Jul 2025 22:02:20 +0100, NY wrote:

Doesn't work when connected through USB.

Sorry I hadn't realised that connection by USB was essential and that
you couldn't alternatively use a network (Ethernet/Wifi) connection.

Don't know why the OP would insist on USB; he didn't mention what RPi he
is using. But I agree on Ethernet or WiFi, even headless (SSH).

Maybe because he has no Ethernet on a PI Zero (w)

The request is how to do KVM stuff via a USB connection.


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From Newsgroup: comp.sys.raspberry-pi

On 11/07/2025 07:30, mm0fmf wrote:

On 11/07/2025 06:23, David Taylor wrote:

On 11/07/2025 01:37, vjp2.at@at.BioStrategist.dot.dot.com wrote:

If I connect the RasPi to my laptop by USB is there any software
which allows my laptop to be KVM (Keyboard, Video, Mouse)?

PuTTY may work, but it doesn't have graphics.

I recall PuTTY having some X11 extension, but I use VNC which, I
suspect, is LAN/WiFi only.

Setup RNDIS and you have a network connection between the two over USB.

The first search hit on RNDIS for Linux was how they are trying to
expunge the horribly insecure Microsoft protocol from the Linux kernel!

---druck
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From Newsgroup: comp.sys.raspberry-pi

On 15/07/2025 21:04, druck wrote:

On 11/07/2025 07:30, mm0fmf wrote:

On 11/07/2025 06:23, David Taylor wrote:

On 11/07/2025 01:37, vjp2.at@at.BioStrategist.dot.dot.com wrote:

If I connect the RasPi to my laptop by USB is there any software
which allows my laptop to be KVM (Keyboard, Video, Mouse)?

PuTTY may work, but it doesn't have graphics.

I recall PuTTY having some X11 extension, but I use VNC which, I
suspect, is LAN/WiFi only.

Setup RNDIS and you have a network connection between the two over USB.

The first search hit on RNDIS for Linux was how they are trying to
expunge the horribly insecure Microsoft protocol from the Linux kernel!

---druck

Oh noes!!!!!! MS and insecure protocols.

Yes, RNDIS is insecure. But do you know what, if you allow someone to
plug any random device into your computer then insecure protocols are
the least of your problems. If it's your device and your computer then
it's no big deal.

It's still in the 6.12.x kernel on Raspberry Pi OS.

And when it's dropped then stand by for howls from just about every
Android owner on the planet when they find USB Tethering no long works
with Linux.

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From Newsgroup: comp.sys.raspberry-pi

mm0fmf <none@invalid.com> wrote:

On 15/07/2025 21:04, druck wrote:

On 11/07/2025 07:30, mm0fmf wrote:

On 11/07/2025 06:23, David Taylor wrote:

On 11/07/2025 01:37, vjp2.at@at.BioStrategist.dot.dot.com wrote:

If I connect the RasPi to my laptop by USB is there any software
which allows my laptop to be KVM (Keyboard, Video, Mouse)?

PuTTY may work, but it doesn't have graphics.

I recall PuTTY having some X11 extension, but I use VNC which, I
suspect, is LAN/WiFi only.

Setup RNDIS and you have a network connection between the two over USB.

The first search hit on RNDIS for Linux was how they are trying to
expunge the horribly insecure Microsoft protocol from the Linux kernel!

---druck

Oh noes!!!!!! MS and insecure protocols.

Yes, RNDIS is insecure. But do you know what, if you allow someone to
plug any random device into your computer then insecure protocols are
the least of your problems. If it's your device and your computer then
it's no big deal.

If it's your device and your computer you could just use CDC-NCM instead.
I've used that successfully between Pi-like devices (Beaglebone Black) and FreeBSD servers.

Here's the script, based on the Beaglebone Linux's bb-usb-gadgets package: https://github.com/CTSRD-CHERI/morello-bbb-ubuntu-image-builder/blob/master/morello/bb-start-acm-ncm-rndis-old-gadget

It does some combination of USB serial (CDC-ACM), mass storage, RNDIS and
NCM depending on which options you pick.

Theo
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From Newsgroup: comp.sys.raspberry-pi

Theo <theom+news@chiark.greenend.org.uk> wrote:

Here's the script, based on the Beaglebone Linux's bb-usb-gadgets package: https://github.com/CTSRD-CHERI/morello-bbb-ubuntu-image-builder/blob/master/morello/bb-start-acm-ncm-rndis-old-gadget

Found the upstream bookworm version: https://github.com/rcn-ee/repos/tree/master/bb-usb-gadgets/suite/bookworm/debian
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From Newsgroup: comp.sys.raspberry-pi

On 17/07/2025 12:39, Theo wrote:

mm0fmf <none@invalid.com> wrote:

On 15/07/2025 21:04, druck wrote:

On 11/07/2025 07:30, mm0fmf wrote:

On 11/07/2025 06:23, David Taylor wrote:

On 11/07/2025 01:37, vjp2.at@at.BioStrategist.dot.dot.com wrote:

If I connect the RasPi to my laptop by USB is there any software
which allows my laptop to be KVM (Keyboard, Video, Mouse)?

PuTTY may work, but it doesn't have graphics.

I recall PuTTY having some X11 extension, but I use VNC which, I
suspect, is LAN/WiFi only.

Setup RNDIS and you have a network connection between the two over USB. >>>

The first search hit on RNDIS for Linux was how they are trying to
expunge the horribly insecure Microsoft protocol from the Linux kernel!

---druck

Oh noes!!!!!! MS and insecure protocols.

Yes, RNDIS is insecure. But do you know what, if you allow someone to
plug any random device into your computer then insecure protocols are
the least of your problems. If it's your device and your computer then
it's no big deal.

If it's your device and your computer you could just use CDC-NCM instead. I've used that successfully between Pi-like devices (Beaglebone Black) and FreeBSD servers.

Here's the script, based on the Beaglebone Linux's bb-usb-gadgets package: https://github.com/CTSRD-CHERI/morello-bbb-ubuntu-image-builder/blob/master/morello/bb-start-acm-ncm-rndis-old-gadget

It does some combination of USB serial (CDC-ACM), mass storage, RNDIS and
NCM depending on which options you pick.

Theo

That's neat and cute and works nicely. It's cleaner than the one I use
at work for setting up RNDIS gadgets on our USB IP for customers.
Customers always ask for RNDIS but offering NCM will maybe make them move.

Of course it took longer to figure out why naff all happened when trying
this on an RPI Zero and that's because I'd forgotten to load the USB
driver in OTG mode. Even Windows played nicely with installing its NCM
drivers which is probably a first.

If only my modern-ish Android 14 phone would use NCM not RNDIS.

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