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Why is only one device being allowed on the internet through a router

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This can happen when your Wi-Fi "router" is actually just bridging, and your broadband modem latches onto the first LAN-side MAC address it sees after it boots. DOCSIS-compliant cable modems are especially likely to do this to you.

The solution is to put your Wi-Fi router back into NAT gateway mode and make sure your Wi-Fi router's WAN port (not its LAN port) is the only thing connected to the LAN side of the cable modem. Then fully power down the cable modem and then boot it back up. That the router's WAN MAC address will be the one the cable modem latches onto, because no other machine's MAC address will be visible to the cable modem.

Note: If your cable modem includes telephone gateway functionality (VoIP, "digital voice", eMTA, etc.), it may have a built-in battery backup, so when you unplug the cable modem, be sure to look to see if you need to also unplug the backup battery in order to fully power-down the unit.

Note also that accidentally connecting one of your Wi-Fi router's LAN ports to the cable modem can have this same effect, as it means that the Wi-Fi router will simply be bridging your LAN/WLAN traffic over to the cable modem, so all your devices' MAC addresses will be visible to the cable modem. So if someone accidentally (re-)connected a cable to the wrong port, just switch it back to the WAN port.


nmap -T5 -sP 192.168.0.0-255

Update 28-Jul:
It all turned out that simply set static IP (Manual DHCP) to 192.168.1.xxx can work. Thing confused me is that how can Mac OSX auto set IP to 192.168.1.2 ? Even though it is connected to 192.168.0.1xx route with DHCP On? May be it is configured before ? I don't think so since I have reset my computer after bought it from friend few month ago.

Notes:
My Mac WLan IP: 192.168.1.2
Wifi connected Wifi_One: TL-WR 740N (TP-Link). DHCP ON, IP  range: 192.168.0.100-192.168.0.199; WAN Cable disconnected.
Modem optical fiber (FPT): 192.168.1.1
Switch: TP-Link 8 LAN ports.
XiaoMi WiFi Gen 3: 192.168.1.31, connected to WR 740n.

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