Hello,
I'm looking for help to understand an issue we are observing on Ubuntu 22.04.
networkd is failing with "netdev could not be created: Invalid argument" when I try to create either an ip6gre or vti6 device.
We believe this problem started when we pulled this change [1] in
to the kernel 5.15. The problem also happens with the most recent
upstream kernel so it's not an issue introduced by Ubuntu.
The problem doesn't happen on recent versions of systemd but we'd
like to fix it on systemd 249 (used by Ubuntu 22.04).
How to reproduce the problem (tested on Ubuntu 22.04 (jammy) with
systemd 249.11-0ubuntu3.11 and kernel 5.15.0-89-generic):
--- /etc/systemd/network/tun0.netdev ---
[NetDev]
Name=tun0
Kind=ip6gre
[Tunnel]
Independent=true
Local=fe80::1
Remote=2001:dead:beef::2
------
--- /etc/systemd/network/tun0.network ---
[Match]
Name=tun0
[Network]
LinkLocalAddressing=ipv6
ConfigureWithoutCarrier=yes
------
After restarting networkd I see this in the logs
tun0: netdev removed
If we boot a kernel that doesn't have
[1], the interface tun0 is created.
Here is the full log with debug enabled https://paste.ubuntu.com/p/dPbPxgRThW/
As I said, the problem seems to be
fixed already in systemd, but I'm looking for help to understand
what changes fixed it.
The theory is that the netlink attributes used to configure the
tunnel local/remote IPs might be wrong.
This problem is documented here https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2037667
Thanks in advance.
[1] -
https://github.com/torvalds/linux/commit/b0ad3c179059089d809b477a1d445c1183a7b8fe
