I have a wireless home network set up around a router that I upgraded from OpenWRT 19.07 to 21.02.1 a couple of weeks ago. Two devices are connected to the router wirelessly, both of which are able to access the Internet, and either can also connect via SSH to the router itself. I am however unable to establish an SSH connection from one device to the other; attempting to do so returns an error message ‘No route to host’. A ping from one to the other returns ‘Destination Host Unreachable’.
Name resolution works correctly: both devices’ names resolve to their local IPv4 addresses. I can also connect to either device from the router. Strangely, I am also able to establish an SSH connection between one device connected via a wired Ethernet connection and another connected wirelessly.
I remember this working fine back when I was running 19.07. How can I possibly diagnose or fix this?
