JT Strickland
Very Senior Member
Have you tried cloning the MAC address of the existing router's WAN interface to your router before connecting to the ONT? DNS servers would only affect name resolution.
First, make sure the router receives an IP address on the WAN interface via DHCP. Assuming no 802.1x, PPPoE, IPoE, hostname, or other DHCP field requirements, it should just work. The ONT may be looking for the MAC of the old router. Assuming you've rebooted the ONT after connecting your router, if it's not getting an IP even w/ a cloned MAC address, there's an authentication bit missing.
DNS server symptom would be WAN interface receiving an IP but browser or other clients unable to resolve hostnames.
No, but I will. I'll have to research how to clone it. Thanks! The Zyxel actually looks like a pretty fair router from the specs.