The ip i get from cables change when i change my router

im connected to cable at 200/5 Mbit.
im using TP-Link TL-WR1043N/ND v2 running OpenWrt 19.07.2 .
i get ip that start in 77.139
i want to change my router to tp-link C6U running OPEN WRT 21.02.
the ip i get start with 5.
the configuration on both routers is similar and only different are caused by the different openwrt versions.
i appreciate suggestions to solve this.
thank u.

The difference is caused by different MACs, try cloning the WAN port MAC.

thank u for the suggestion.
i cant find how to do it.
can u point me in the right direction plz?
thank u

i found how to do it on OPEN WRT 21.02 and its working.
here's how to change the wan port mac to the the new router:
than copy the existing mac to text file just in case the something went wrong.
delete the mac and type the new mac in the Mac Address field.
than save and apply all changes and check the the mac is still there.

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