Maybe your cable modem already does does NAT and DHCP , and you end up with multiple addresses on ER in same subnet.
Try changing IP address on LAN port before connecting the cable modem. (re-run wizard with different LAN subnet)
Maybe your cable modem already does does NAT and DHCP , and you end up with multiple addresses on ER in same subnet.
Try changing IP address on LAN port before connecting the cable modem. (re-run wizard with different LAN subnet)