I also have some issues to connect from the ZTE H267A, to Juniper SSG5 firewall or DD-WRT router. I followed the instructions from patricktoh, create VLAN500, turned off the PPPoE, and set LAN1 to VLANID 500. But the firewall/router keep showing unable to connect.

I tested with the few scenarios below, but none of them work.

1.) ZTE H267A LAN1(VLANID:500) > Juniper SSG5 PPPoE
2.) ZTE H267A LAN3(PVID:500) > Juniper SSG5 PPPoE
3.) ZTE H267A LAN1(VLANID:500) > DD-WRT WAN1 PPPoE
4.) ZTE H267A LAN3(PVID:500) > DD-WRT WAN1 PPPoE
5.) ZTE H267A LAN1(VLANID:500) > DD-WRT WAN1 with VLAN2.500 PPPoE
6.) ZTE H267A LAN3(PVID:500) > DD-WRT WAN1 with VLAN2.500 PPPoE

Anyone can enlighten me how to make it work?