Hi, for me not listening ipv4 explicitly cause problems. I created tcp proxy device for forwarding ssh port:
sudo lxc config device add <container-name> <device-name> proxy listen=tcp:0.0.0.0:10122 connect=tcp:127.0.0.1:22, it only shows listening to :::10122. I can connect to :10122 from Linux and Windows, but NOT from a SunOS system which is our dedicated server for tunneling ssh.
In the mean time, if I create ssh port forwarding on host (which listen to both 0.0.0.0:10122 and :::10122), I can connect to it from the SunOS system.