Address problems with a custom router under ISP NAT settings
Address problems with a custom router under ISP NAT settings
Hi there! Recently I switched my ISP, which also changed the router setup. Previously, the provider used an ONT with a built-in router, but now they gave me a router that includes an ONT and supports 4G fallback via a SIM. My plan is to set up these connections: [Switch LAN]----[(lan port) Router ASUS and WiFi (WAN port)]----[(lan port) ISP Router (FTTH port)]. I configured the ISP router with the subnet 192.168.1.0/24 and the ASUS router with 192.168.10.0/24. When trying to use DHCP on the ASUS, it didn’t assign an IP, saying the WAN DHCP isn’t working. I switched it to static mode, set the gateway and DNS, but the ASUS still complains its IP isn’t public for DNS services. From the LAN side, I can ping the WAN IP (192.168.1.2) but not reach the ISP router (192.168.1.1), and I can’t access the internet from my home network. The ISP router’s answer pings in LAN are fine, yet it doesn’t appear to be doing NAT. For now, I’m sticking with the ISP router for Wi-Fi, though its performance is poor and admin passwords reset daily. I’m wondering if using subnet class C causes issues—does ASUS block NAT on that setting? If so, what IPs and netmask should I use to avoid conflicts with the ISP’s WAN IP? Thanks for your help!
Is the modem/router setup allowing Bridged Mode? Your current goal of setting up a Double NAT should be avoided unless necessary.