Hey guys I need someone to help with solving this

I have a vr600 "ac2100" as my modem and surveillance system connected to the ethernet 

And other port eth0 to deco m5

I want to setup vr600 as pure modem to solve double nat

I did the same as the guid provided by tplink 

Advance > internet > mode as bridge and delete pppoe but didn't disable any dchp settings as it's not mentioned in the guid and I have it as 192.168.1.1 

The setup deco m5 as router and choose pppope and put username and password 

And dchp is on main as 192.168.68.1 and same subnet 

But I don't internet after that 

What am I missing?