... Support multiple WAN access methods, including static IP, DHCP, L2TP, PPTP, PPPOE, 4G. LTE/ 3G/HSPA+ Support double link backup between ... LTE/ WCDMA and WAN(PPPOE, ADSL) (optional) Support VPN client(PPTP, L2TP, OPENVPN, IPSEC and GRE)(only for VPN version) Support ... VPN server(PPTP, L2TP, OPENVPN, IPSEC and GRE)(only for VPN version) Support ...