Hi, we have been using this router for internet purposes for seven years it’s working properly! But currently add one service in addtional (WAN) VPN/DATA from our ISP company we setup and configured second WAN to connect the Branch its connected work! but from HQ to Branch LAN Defult and all devices pinging properly. and 

from Branch to HQ the LAN default ping the computers or device is not pinging we try multiple things but we can't fix what can we do? Please support us