cannot find device bond0 after recent windows update

[romarowski]

Windows Version

Microsoft Windows [Version 10.0.19045.2728]

WSL Version

1.2.0.0

Are you using WSL 1 or WSL 2?

• WSL 2
• WSL 1

Kernel Version

5.15.90.1

Distro Version

Ubuntu 20.04

Other Software

I am using bond0 to activate matlab licence inside WSL. This worked until today, I either attribute it to recent Windows update or that I installed an Ubuntu GUI app (Terminator) and all the config that came within.

Repro Steps

ifconfig -a

Used to show a bunch of networks including bond0, I honestly dont remember them.

Expected Behavior

Used to show a bunch of networks including bond0, I honestly dont remember them.

Actual Behavior

Only

eth0:

lo:

Diagnostic Logs

No response

[romarowski]

Could this be some change in the kernel?
https://unix.stackexchange.com/questions/665520/multiple-virtual-network-interfaces-in-wsl2

[romarowski]

I am thinking this got changed? https://github.com/microsoft/WSL2-Linux-Kernel/blob/a733b4e7e4db00d1647ee23022fbcfce33835c61/Microsoft/config-wsl#L1627

How do I bring it back to true or check the param value?

[OneBlue]

Thanks for reporting @romarowski. We indeed removed that interface since it didn't seem to be useful to anyone. How exactly were you using this interface ? Is there a reason why eth0 doesn't work ?

[romarowski]

Hello, thanks for your answer.
I was using it as a way for MATLAB running inside WSL to verify the license is on the right device. As explained here #5866 (comment)

My understanding is that doing it with ether0 could bring connection issues? Very far from having a clue on what I am doing here so not sure.

I was able to bring bond0 back up by adding to /etc/networks/interfaces
auto bond0 iface bond0 inet static address <ip> netmask 255.255.255.0 slave eth0

and then
sudo service networking restart

Maybe this would have been easier #5352 (comment)

[OneBlue]

Ok I see. In this case the easiest would probably to create that interface manually via something like:

ip link add name bond0 type bond mode active-backup

See this post with more details

You can add this to boot.cmd in /etc/wsl.conf if you want this to start automatically when WSL starts