ASUS router EA-N66R has different subnet mask than laptop

ASUS router EA-N66R has different subnet mask than laptop

I have a new ASUS router that works perfectly, and I'm trying to set up an
ASUS EA-N66R repeater to use with that router. But when I connect my
Ethernet from my laptop to the repeater, the setup will not launch for the
repeater, only for the source router (using asusrouter.com and also trying
IP address 10.0.1.1, and also downloading the utilities from asus to
configure it). The utility says that my laptop has a different subnet mask
than the router, so the configuration option will not launch. The laptop
is set to obtain IP addresses automatically for IPv4. The utility from
asus says that the repeater subnet mask is 255.255.255.0, as well as the
source router. Should I use a temporary static ip address for my laptop
with a certain subnet mask to get it working? The source router gets it's
signal from a cable modem. Any help with this would be appreciated.