Which screen should be used to add port 22 in luci? If I connect to my MT300N’s wifi, I can SSH to the MT300N’s lan IP address (192.168.8.1). But if I try to SSH to the MT300’s wan port (192.168.67.125), the connection attempt is refused. That is typical for many routers; they typically require some box to be checked to allow SSH access via the WAN port.
The MT300N simple GUI does not have such a check box. The Luci GUI has a screen under System → Administration SSH Access, but it apparently just sets up listening.
To actually allow WAN SSH access, one must use Network → Firewall → Traffic Rules (Open ports on router).