Model :

Hardware Version : Not Clear

Firmware Version :

ISP :

My home network has a fiber-optic router that connect to Ethernet and has a DHCP server, but the wireless doesn't work quite well, so I want to configure an Archer C8 as an access-point.
If I connect to my ethernet network as it comes, you can connect wireless and use the internet, but I have a problem with DHCP: all machines connected to the old network uses the DHCP from the main fiber-optics router, but the machines that connects to the C8 get the values from the C8 itself. I have been following the advises for the C7 as in http://forum.tp-link.com/showthread.php?80127-Archer-C7-as-Wired-AP-Bridge.

If I disable the C8 DHCP server, the machines that connect to the C8 can't get IP addresses, even when I change the LAN address and configure the same subnet as the fiber-optic router.
I have configured the DHCP of the C8 to start higher than the fiber-optics DHCP, but I would like to have a more reliable solution.

Any ideas from any network magician?