@Somnus 

Thank you.  The coduim radio hands out a 172.x.x.x address.  I was able to get the wan backup.  My newest issue is after moving to 1.2.3 multi-player games such as world of warship randomly disconnects usually during match making. It doesn't appear to be thr internet dropping as we have voice chat and i can still talk with the other players. I don't recall having this issue with 1.2.2 so I opened a ticket with tp-link and requested 1.2.2. 

I was able to obtain 1.2.2 from tech support.  DHCP now works again.  I guess I'll run that a while.  

Now i'm tracing the gaming issue.  Not sure if its a policy routing issue, bug or something with the routers attack defense.  I've disabled almost all of the attack defense features and created a policy route for the game traffic that will only send it out a single wan.  

Thanks for the help.

  @papac0rn 

The game issue is caused by double-NAT.

The solution is to make your front modem router as pure modem mode, so the ER7206 WAN can obtain public IP directly.

  @Somnus 

Thanks.  I don't think its a double nat issue.  I was able to trace this down to a policy routing issue.  If I leave link backup disabled and configure policy routing everything appears to be working. I can route a subnet, a workstation and/or this game out an interface.  It seems after some time or something gets tripped with policy routing enabled it disconnects. If I enable link backup and designate a single wan as the primary no load balancing the game will run fine for hours. With link backup though the router acts like its ignoring policy routing.  For example my workstation continues to go out the primary wan even when policy routing says for this single ip use the second wan.  

I will play more with it today.  Its quirky but were getting there.