Comment 12 for bug 2037667

Testing with that commit reverted, it works. Testing on a 6.5 kernel on jammy fails. When testing on mantic, it works. When testing on mantic, on an lxc jammy container, it fails inside the container, with that same kernel.

So, it looks like systemd-networkd sets up the Local tunnel address as the IFLA_ADDR, and the Remote tunnel address as the IFLA_BROADCAST netlink attributes. This is what the validation from commit b0ad3c179059 is trying to validate. Those attributes are supposed to be hardware addresses, not the tunnel addresses.

This needs to be investigated on the systemd side. As I read the systemd code from the jammy version, I didn't find where this would be incorrectly set. It may be necessary to revert this kernel code, fix systemd, and wait for some time before reintroducing this kernel fix. That all depends on why exactly systemd is doing this. Depending on the resulting investigation, we will need to reassess if this can be reasonably be used to revert that commit upstream. But given newer systemd does the right thing, it might be hard to do it.

Cascardo.