Upgraded 19.07 to 21.02 and router stopped working

Ok I just checked quickly... two things:

Probably you are lxc-attaching right? Because attach notoriously doesn't export all paths and variables. It's the same for me. If you go over ssh, and I guess lxc-console as well, it's everything in place tho.

Probably you restored a configuration from another router? Because SFO should not be available for x86_64. See Software flow offloading for containerized OpenWrt

As also @anon50098793 said, that's related to the host kernel.Kernels from major distros (at least Debian based) appear to work well without any specific tuning, at least i had no issues so far. And in any case it's just a warning, should be safe to ignore.

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