USB Ethernet Gadget Address Issue #233

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opened 2026-02-20 13:22:51 -05:00 by deekerman · 3 comments

deekerman commented

2026-02-20 13:22:51 -05:00

Owner

Originally created by @adjscent on GitHub (May 5, 2021).

Originally assigned to: @mdevaev on GitHub.

Describe the bug
Ubuntu 20.04.1, when connected to the pikvm via USB-Ethernet Gadget, does not forward packets properly as it seems to not like 169.254.0.X addresses. Propose to be able to configure the IP address of usb0 and its dhcp range.

To Reproduce
Steps to reproduce the behaviour, like:

Connect pikvm to a pc running Ubuntu 20.04.1
Run ping 8.8.8.8 on the pc.
Ping fails
Tcpdump shows that the pc did send out the icmp packet via usb0 but did not use the source address 169.254.0.X given by the pikvm's dhcp server. (It used my docker bridge address)

Expected behaviour
Ping should work.

Desktop (please complete the following information):

OS: Ubuntu 20.04.1

Pi-KVM info:

Raspberry Pi board version [RPi 4]
Pi-KVM platform [v2-hdmi]
Video capture type [USB]
KVMD version: kvmd 2.62-1 kvmd-platform-v2-hdmiusb-rpi4 2.62-1 kvmd-webterm 0.38-1
uStreamer version: ustreamer 3.27-1
Linux kernel: Linux pikvm 5.10.33-1-ARCH #1 SMP Fri Apr 30 17:52:59 UTC 2021 armv7l GNU/Linux

Additional context
The USB Ethernet works well on my Windows 10 20H2 pcs.

Originally created by @adjscent on GitHub (May 5, 2021). Originally assigned to: @mdevaev on GitHub. **Describe the bug** Ubuntu 20.04.1, when connected to the pikvm via USB-Ethernet Gadget, does not forward packets properly as it seems to not like 169.254.0.X addresses. Propose to be able to configure the IP address of usb0 and its dhcp range. **To Reproduce** Steps to reproduce the behaviour, like: 1. Connect pikvm to a pc running Ubuntu 20.04.1 2. Run ```ping 8.8.8.8``` on the pc. 3. Ping fails 4. Tcpdump shows that the pc did send out the icmp packet via usb0 but did not use the source address 169.254.0.X given by the pikvm's dhcp server. (It used my docker bridge address) **Expected behaviour** Ping should work. **Desktop (please complete the following information):** - OS: Ubuntu 20.04.1 **Pi-KVM info:** - Raspberry Pi board version [RPi 4] - Pi-KVM platform [v2-hdmi] - Video capture type [USB] - KVMD version: kvmd 2.62-1 kvmd-platform-v2-hdmiusb-rpi4 2.62-1 kvmd-webterm 0.38-1 - uStreamer version: ustreamer 3.27-1 - Linux kernel: Linux pikvm 5.10.33-1-ARCH #1 SMP Fri Apr 30 17:52:59 UTC 2021 armv7l GNU/Linux **Additional context** The USB Ethernet works well on my Windows 10 20H2 pcs.

deekerman

2026-02-20 13:22:51 -05:00

closed this issue
added the
resolution:fixed

type:question
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deekerman commented

2026-02-20 13:22:53 -05:00

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@arch1mede commented on GitHub (May 9, 2021):

The "bug" is detailed in step 2 of https://github.com/pikvm/pikvm/blob/master/pages/usb_ethernet.md#ethernet-over-usb-network, this function is for communication between pikvm and target ONLY

If you are looking at eth pass through you might be interested in: https://pastebin.com/u/srepac override.yaml

@arch1mede commented on GitHub (May 9, 2021): The "bug" is detailed in step 2 of https://github.com/pikvm/pikvm/blob/master/pages/usb_ethernet.md#ethernet-over-usb-network, this function is for communication between pikvm and target ONLY If you are looking at eth pass through you might be interested in: https://pastebin.com/u/srepac override.yaml

deekerman commented

2026-02-20 13:22:53 -05:00

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Owner

@adjscent commented on GitHub (May 11, 2021):

My issue is with the DHCP range of the otgnet. But I realise it is a TODO feature so I will close this.

@adjscent commented on GitHub (May 11, 2021): My issue is with the DHCP range of the otgnet. But I realise it is a TODO feature so I will close this.

deekerman commented

2026-02-20 13:22:53 -05:00

Author

Owner

@mdevaev commented on GitHub (May 14, 2021):

@adjscent You can customize internal usb network range in /etc/kvmd/override.yaml. For example:

otgnet:
    iface:
        net: 10.0.0.0/28

@mdevaev commented on GitHub (May 14, 2021): @adjscent You can customize internal usb network range in `/etc/kvmd/override.yaml`. For example: ```yaml otgnet: iface: net: 10.0.0.0/28 ```