Did you disable the DHCP server on the Netgear N600 router? Did you connect the Ethernet cable from the Pace 5286AC to one of the four networking ports (not the Internet/WAN port) on the back of the Netgear router?
Generally any time you add a second router into the mix as a switch or hub you have to disable that second router’s DHCP server via the second router’s administration page. One also generally has to connect the two routers together via Ethernet cable by connecting the cable from one of the four network ports on router 1 to one of the four networking ports on router 2. If you connect the cable to the Internet/WAN port on router 2 you will typically run into problems with the Firewall on router 2 blocking/filtering traffic from router 1.
