为何Google检测的IP与DIR-600M路由器显示的IP不一致？

Hey there, let's walk through the most common reasons why you're seeing mismatched IP addresses when setting up port forwarding on your DIR-600M:

• Carrier-Grade NAT (CGNAT) from your ISP
  This is the most likely culprit these days. With IPv4 addresses running out, many internet providers assign a single public IP to an entire neighborhood or group of users. Your router gets an internal IP from the ISP's private network instead of a true public IP. When you search "my ip" on Google, you're seeing the ISP's shared public IP, while your router's status page shows the private IP it received from the ISP. Unfortunately, you can't set up standard port forwarding in this case—you'll need to ask your ISP for a dedicated public IP, or use a service like a VPN with port forwarding or an internal network tunneling tool.

• Double NAT setup
  If you have a modem (like your ISP's fiber/cable box) that's also acting as a router, and you've connected your DIR-600M to it, you're in a double NAT scenario. The modem handles the first layer of NAT and gets the public IP, while your DIR-600M receives a private IP from the modem. Google shows the modem's public IP, but your router's status page displays the private IP from the modem. To fix this, you can either:

  • Switch your modem to bridge mode, so your DIR-600M directly connects to the internet and gets the public IP.
  • Set up port forwarding on both the modem and the DIR-600M (forward the desired port from the modem's public IP to your DIR-600M's private IP, then forward it again to your desktop's IP).

• Browser cache, proxy, or VPN interference
  Sometimes your browser might cache an old IP address, or you could have a proxy server or VPN running in the background without realizing it. This makes Google show the IP of the proxy/VPN instead of your actual public IP. Try clearing your browser's cache, closing any proxy/VPN connections, and searching "my ip" again to see if the addresses align.

• Checking the wrong router IP
  Double-check that you're looking at the WAN port IP in your DIR-600M's status page, not the LAN port IP. The LAN IP is the private address your router uses for your home network (usually something like 192.168.0.1 or 192.168.1.1), which will never match the public IP you see on Google. If you accidentally checked the LAN IP, that's an easy fix—just navigate to the WAN status section to get the correct IP your router uses to connect to the internet.

Hope one of these explanations hits the mark. Feel free to follow up if you need help troubleshooting a specific scenario!

内容的提问来源于stack exchange，提问作者user8744140