bonocore:

https://openwrt.org/docs/guide-user/network/openwrt_as_clientdevice procedure seems to be incomplete.

In details, after following the procedure, connection to Luci / ssh will not work because of the firewall

Connecting on the WAN / other router network, you will be able to ping OpenWRT device but not to log into administrative web or ssh interfaces. Need to integrate the doc with instruction to allow firewall rules and port mapping, as per http://blog.differentpla.net/blog/2015/05/27/openwrt-ssh-wan/