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I want to connect to a WAN dynamic IP without DDNS, due to my router having problems when using DDNS. Is this possible and how do I do so?

  • I want to host a Minecraft server and let somebody else join
  • I know both the WAN IP and the target machine's IP within the LAN [192.168.1.55]

EDIT: Set up a web server behind a Carrier Grade NAT solved my problem.

2 Answers2

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You indicate that the public IP address that websites report and the WAN IP address your router reports are different. This means you are behind carrier-grade NAT. You will not be able to receive incoming connections with this type of internet connection.

As indicated in the Wikipedia article, you can also infer this by looking at the WAN IP your router reports. If it is in one of the following ranges, you are affected:

  • 10.0.0.0/8 (10.0.0.0 to 10.255.255.255)
  • 100.64.0.0/10 (100.64.0.0 to 100.127.255.255)
  • 172.16.0.0/12 (172.16.0.0 to 172.31.255.255)
  • 192.168.0.0/16 (192.168.0.0 to 192.168.255.255)

However, there is no guarantee that other WAN IP addresses are "safe", the ISP could decide to use whatever address range here. Testing the reported and actual public IP address is the safest way to check.

It doesn't hurt to ask your ISP whether the connection type could be switched.

user219095
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First things first, there are some troubleshooting steps needed.

  1. try to ping to your DDNS domain from your router configurations itself under Maintenance > Diagnostics > Ping Test (or whatever steps in your router gateway), as I experienced same issue before as the ping test fails due to DNS issue as the router couldn't resolve server name.

  2. Check firewall settings and in some cases DDNS feature doesn't work if DHCP server disabled if the router in AP mode.

  3. latest reason is that your router uses old protocol to comunicate with the DDNS service provider that they already updated as example dynu.com uses latest version of GNUdip protocol for security reasons and your router uses an outdated version.

But if you insist to use DDNS feature from your router itself without any addtional device running client software you may need to test DDNS-over-CWMP it uses Google Script as ACS endpoint and it can update update IP changes to DuckDNS.org once the router powered on, rebooted and periodically in seconds this is actually any DDNS client do and tested with 12 years old routers and it works as expected.

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Finally you can use tunneling services like that

Mamdouh Saeed
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