Figure 3-6 WAN Settings
DNS Mode set how to get DNS server IP:
Automatic: automatically obtain the DNS server IP assigned by EPC. If Manually
DNS is not selected, it is automatic mode.
Manually: manually configure the primary and standby DNS server IP.
3.2.2.2 Tunnel Mode
This CPE can support L2TP, GRE, PPTP, and VxLAN VPN type.