i need help with preview on lan using TP-LINK router

Hello everyone! i recently buy a TP-Link router, for my house to get a better wifi signal, everything perfect at the moment but i tried to preview on lan a game and i noticed that the ip changed (obviusly) and for some reason i can preview on my phone or any other device, i think it because the TP-LINK have the ports changed and i dont know how to set it up, does someone knows what i have to do?

open c2.

Preferences

preview on LAN address push the ...

It should pick up your new address.

click it.

restart.

OR

Do you mean aTP-LINK range extender?

You can set static ip, I pretty much mirrored everthing from my router including the ip

and sharing same ip does cause havoc with my eset antivirus, so had to create an exception (shared ip)

Edit:

Ports etc

If it worked before, is should work fine after. i cycle routers every couple months to a year with no issues. As long as your firewall allows ports 50000-50100 you are fine(you can choose your own range too).

I just set up ESET which took over my windows firewall. So ashleys tut is pretty good with stuff like that