Check your router settings to enable a larger DHCP pool size, ensuring it supports more than 256 addresses.
Check your router settings to enable a larger DHCP pool size, ensuring it supports more than 256 addresses.
So unless you're providing login details for the router itself, the IP passthrough setting is controlled by the modem/ONT. If you updated the router's firmware to OpenWRT, they would still recognize it as a TP-Link device since the MAC Address remains unchanged. Because the MAC address stays the same, you likely won't need to involve CenturyLink when flashing OpenWRT, as the IP Passthrough would reference your router using its MAC address. The MAC address also identifies the manufacturer. The first six digits of the MAC address are known as the OUI, assigned to specific manufacturers. By the way, I looked into related terms but didn't find any documentation suggesting CenturyLink only supports Cisco and TP-Link routers for IP Passthrough.
Using OpenWrt doesn't alter the MAC address, but it seems they're changing it based on the hostname since the modem displays "Archer_C7" next to the pass-through device.
They obtain the hostname from the DHCP request the router sends. “IP Passthrough” assigns the device a unique public IP instead of a private one, but it remains standard DHCP. Once you update OpenWRT, you can modify the hostname. For caution, keep the router’s WAN cable unplugged until you revert the hostname back to Archer_C7.
Discuss this only if you want further than 256 DHCP addresses.