@y_u_1000
Hello, my friend, it is international community forum, please, use English.
I used Google Translator, so you are talking about NAT. You cannot have access to your LAN network from WAN side because of NAT. It highly depends on what you need exactly. For example, if you need to have remote control or smth like this, then you need to use Port Forwarding (Virtual Servers). Also you can configure PPTP/L2TP-server on TL-ER6120, so the client from WAN-side will connect as PPTP-user and this client will have access to your LAN network. Also you can use IPSec-tunnels. It is not pretty clear, what you need.