How to replace isp-router with LEDE router,when isp router is "tied" with MAC?

Hello i have situation here,wanna use for replace isp router Netis WF2419 mine own TP-Link TL-WR843N/ND v1 with LEDE Reboot 17.01.6 r3979-2252731af4 / LuCI lede-17.01 branch (git-18.201.27126-7bf0367) far as i know isp each client are "tied-up" by MAC,so Netis is mine main router internet getting via dhcp,tp-link is just simple switch+dump AP,what magic need to do in tp-link that i can use him as replace for Netis?:thinking:

Luci allows you to clone the WAN MAC.

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yes i know that this feature in openwrt.

In LuCI, go to Network-Interfaces-WAN-Advanced Settings-fill out the "Override MAC Address" with the MAC of the old router.

In CLI, option macaddr in the WAN block of /etc/config/network.

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As per my understanding, this luci setting WAN Mac is a MAC address set by software. During startup of the device, this is not "active" until the code gets executed and so the hardware MAC is presented to WAN (temporarily).
This is the experience I had when the Cable Modem detected that change and always "thought" that the router device behind the modem is changing because the MAC address was changing (during startup).