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