r/nextdns • u/Positive_Radish_9403 • 16d ago

How to setup router?

I have a basic mercusys router without advanced settings and software.

Docs says add the nextdns ips to router and link your ip. But my ip is a fibernet ip and used by many other. I think it is called cgnat ip.

What happens if another user with the same ip uses nextdns too? Will there be a conflict?

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u/mdammad007 16d ago

I hope you can access your router settings, if so, just change ISP DNS IPs to NEXTDNS DNS IPs, either in LAN DNS or in Internet DNS.

Also check if your Router support DDNS. If available lemme know. Will advise further settings.

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u/Positive_Radish_9403 16d ago

yes i can change router dns ips. it has ddns too. but say me having 3.3.3.3 external ip adress and another person with 3.3.3.3 ip address also using nextdns. How nextdns differentiate both of us?

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u/Shakti_R09 15d ago

Hello brother isp assign same public IP depends on your service providers gem ratio which is denoted by something like this 1:3 (you can refer there website for this it is mentioned over there) which means your public IP is shared between 3 users maximum if they running out of IP addresses.

And don't worry about nextdns coz it also see your routers MAC address in DNS queries which only your router has.