See your new thread.
Edit - Ummm. Not simple. Still see that thread, but I misread it yours initially.
I'm going to ask for the other thread to be locked as this could otherwise get very messy

. Below in this post is everything relevant from that thread.
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OK. It looks from the TG589vn specification that it doesn't have an Ethernet WAN port. Unless there is some custom firmware to convert a LAN port. You can't do it as they come out of the box.
But you can do it after unlocking the HG612 if we change it from Bridge mode to Modem/router mode. We then connect LAN1 of the HG612 to a TG LAN port and disable DHCP on the TG. We also ensure they are both on the same LAN IP address subnet, and give the TG an address outside the allocatable range of the HG612.
That isn't a difficult task. It's the standard way of using a second router to extend the LAN connections and wifi range of a single one.
The LAN2 on the HG612 means you still have four Ethernet ports available if you need them all
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
My broadband basic info/help site -
www.robertos.me.uk. Domains, site and mail hosting -
Tsohost.
Connection - AAISP Home::1 80/20. Sync 59999/14372kbps @ 600m. -
BQM
Edited by RobertoS (Wed 14-Oct-15 22:04:32)