I loaded OpenWrt 19.07.3 into a TP-Link Archer C20 V4 Router. Everything worked fine as a client device on my existing HAN (Home Area Network) with Gateway address at 192.168.1.1 to Spectrum Cable service.
The WAN port address on the router that came with the Cable Modem was 188.8.131.52.
After connected to the Cable Modem, the LAN side of the OpenWrt Router operations seemed to remain normal. However, the connection to the Modem could not be established. Accessing through the LuCI, its "Network - IPv4 Upstream" information panel was missing, followed by "Active connections ?", as if the cable to the Modem was disconnected. Although, the status LEDs on the associated ports were flashing, hinting some handshaking was going on attempting to make the connection.
Could anyone kindly clarify what was happening and whether there is any limitation on the IP address range that OpenWrt would accept on its WAN port? What could I do to cross this hurdle?
Thanks a lot,
Abe (2020-07-31 09:52)