|After reading through the other thread it appears to me your internet is working fine for wired clients, but not for wireless clients.|
If your router's DHCP is properly configured and clients connecting to your WLAN are also set to "get IP automatically" (DHCP) then they should also connect to the internet without issue.
You need to resolve this issue before bringing any other routers into this.
Start by picking one wireless client (preferably a laptop or computer of some sort, not a phone or pad) and try to connect. What happens?
Are you able to connect to the wireless network? If yes, open a command prompt window on your wireless client (ie: Start >> Run >> type cmd and hit Enter) and perform the following command: ipconfig /all
Now do the same on a wired client that is working and compare. All TCP/IP settings except for the actual IP Address should be identical. If they're not, copy and paste the output of both here (labelled correctly) so we can see.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.