@chiptransisto 

If you connect the modem to WAN2, can you get any WAN IP address? If yes, try setting DNS as 8.8.8.8. If no, try MAC clone.

BTW, when you selected ports as WAN ports, did you click save button? You can post some screenshots of your settings for further discussion. Until now, my router connecting two modems works without problem.

@chiptransisto  Thanks for the response.

WAN1 and WAN2 are set up exactly the same. Both have DynamicIP selected.

When the modem is plugged into WAN1, it pulls all the IP information.

When the modem is plugged into WAN2, no IP information is pulled down. All fields that are populated when WAN1 is connected are blank when WAN2 is connected.

Help!

@chiptransisto 

Try MAC clone. Cloning the MAC address if the laptop to the WAN2 interface.

If it still doesn't work, you need to check the physical issue. When you plug the modem into WAN2, does the port light of WAN2 come on? If you configure it as a LAN port and plug a laptop into it, will the laptop get internet?

And how did you select two ports as WAN ports? You can post some screenshots of the settings. This shouldn't be a problem, as I think.

@Somnus I am attaching some screenshots.

When I plug the modem into WAN2, the lights on the R605 blink like it does when I plug it into WAN1.

I am not sure I know how to "Cloning the MAC address " to the laptop. I have several computers, iPads, TVs hooked so cloning on a computer would not work for my other devices, would it?

"If it still doesn't work, you need to check the physical issue. When you plug the modem into WAN2, does the port light of WAN2 come on? YES.

If you configure it as a LAN port and plug a laptop into it, will the laptop get internet?" I will try that this morning.

And how did you select two ports as WAN ports? You can post some screenshots of the settings. This shouldn't be a problem, as I think. ATTACHED. 

@chiptransisto Follow up. I changed WAN2 back to a Lan port, hooked up a computer to that port and it works as a Lan port.

I then changed it back to WAN2 and also my third Lan port was changed to WAN3. I hooked my modem to WAN2 then to WAN3 - same result, no connection to ISP.

Every time I made a change, I clicked on Save. When I clicked on Save, the router rebooted.

Thanks for your help. Any suggestions.

@chiptransisto 

If WAN2 as a LAN port works without issue, I think the hardware is good and the issue is still on configuration. MAC Clone may still work. Try the following steps:

1. Plug a laptop directly to the modem, make sure the laptop has internet access and record its IP info.

2. Unplug the laptop, and plug the modem to WAN2 port of TL-R605, laptop to LAN port. Like modem--->WAN2, LAN--->laptop. Make sure all cables are good.

3. Log in to the web management page of TL-R605, and go to Network-->MAC-->Clone current PC's MAC

Hope that helps!