My cable modem is connected to Archer AX72 Pro WAN port. One PC is connected to LAN port of Archer AX72 Pro. The cable modem ip address is: 192.168.0.1, the ip of Archer AX72 WAN port is: 192.168.0.2, the ip of Archer AX72 LAN port is: 192.168.1.1, and the ip of PC is: 192.168.1.2.

When I do ping to 192.168.100.1 from PC, I get "Request timed out.".

When I connect another PC directly to cable modem, and I do ping  to 192.168.100.1, I get a successfully response.

Would You please help me with this problem?

Thanks in Advance.