logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

Horizon Go UPC Decoder & Asus RT-N18U Router: Configuring DDNS with NO-IP - Help Needed!

Tomis 5127 14
Best answers

How can I make DDNS with NO-IP work on an Asus RT-N18U router behind a Horizon UPC decoder, and what should be configured in Horizon?

You do not set DDNS itself in Horizon; put the Asus WAN IP into Horizon’s DMZ, then set the actual port forwarding on the Asus router. On Asus, forward the chosen external port to the internal device IP and its internal port, for example external 81 to internal 81 on the controller’s LAN address [#17237791] [#17237932] [#17238488] Leave Src Address empty because it is optional, and access the device from outside by typing your NO-IP hostname plus the external port, such as `ddns-name:81` [#17238574] If the controller also uses UDP, add a separate forwarding rule for that UDP port as well [#17238605]
Generated by the language model.
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
Report a violation of the law
| New topic
  • #1 17237252
    Tomis
    Level 14  
    Posts: 204
    Rate: 6
    Hello, I need help configuring this Horizon decoder with UPC. Question - I want to run DDNS on the Asus RT-N18U router connected to this decoder, which is the internet source, I can't start it. I have DDNS with NO-IP set in the router but I don't know what to set in Horizon, it does not work. I do not know if it is possible, can someone help?
  • ADVERTISEMENT
  • #2 17237775
    makosuu
    Network and Internet specialist  
    Posts: 2984
    Help: 369
    Rate: 370
    Horizon probably cannot work in bridge mode and Asus will probably not be able to enable DDNS with a private address on the WAN.
  • ADVERTISEMENT
  • #3 17237779
    Tomis
    Level 14  
    Posts: 204
    Rate: 6
    In ASUS, I have another soft from TOMATO uploaded, so it can be set only as Horizon is to let it pass?
  • #4 17237791
    makosuu
    Network and Internet specialist  
    Posts: 2984
    Help: 369
    Rate: 370
    In Horizon, make a DMZ to an address as is on the WAN Asus.
  • ADVERTISEMENT
  • #5 17237874
    Tomis
    Level 14  
    Posts: 204
    Rate: 6
    In DMZ I entered the address assigned to horizon asus (the same as the WAN address in the router settings), do you need to reset everything is not working yet, any hint how to check in sequence?

    Added after 11 [minutes]:

    I noticed that on horizon in "internet status" the address was set to the same as in ddns to no-ip
  • ADVERTISEMENT
  • #6 17237932
    makosuu
    Network and Internet specialist  
    Posts: 2984
    Help: 369
    Rate: 370
    Tomis wrote:

    In DMZ I entered the address assigned to horizon asus (the same as the WAN address in the router settings), do you need to reset everything is not working yet, any hint how to check in sequence?


    You've got all the ports forwarded from Horzion to Asus forwarded, it should work.

    Tomis wrote:
    I noticed that on horizon in "internet status" the address was set to the same as in ddns to no-ip


    And good. This is normal


    Got IPv6 or IPv4?
  • #7 17238381
    Tomis
    Level 14  
    Posts: 204
    Rate: 6
    I have IP4, unfortunately it does not work, but the dmz is set from the outside, it is not possible to get to the device - the driver (connected to the router with the www server) ping to IP from DDNS also does not work, I have no idea what is wrong.

    Internally in the network via wifi and the cable can be easily connected
  • #8 17238390
    makosuu
    Network and Internet specialist  
    Posts: 2984
    Help: 369
    Rate: 370
    Have you forwarded ports?
  • #9 17238411
    Tomis
    Level 14  
    Posts: 204
    Rate: 6
    I understand that I turn on this redirection on Horizon in the Forwarding tab, there you must enter Public Port Range, Target IP Address, Target Port Range, Protocol. I don't know much how to arrange it.
  • #10 17238431
    makosuu
    Network and Internet specialist  
    Posts: 2984
    Help: 369
    Rate: 370
    When you connected Asus via WAN, in Horizon only DMZ to Asus's WAN address and you do a redirection on Asus. You connect to this driver by simply typing IP into the browser?
  • #11 17238454
    Tomis
    Level 14  
    Posts: 204
    Rate: 6
    Well, as I am on the internal network, I enter the address, e.g. 10.0.66.11:81 and a website for this driver pops up. I can set the www port in the controller to 80 and then the IP alone is enough

    Added after 2 [minutes]:

    In ASUS this is for the redirection setting:
    Src Address (optional) - Forward only if from this address. Ex: "1.2.3.4", "1.2.3.4 - 2.3.4.5", "1.2.3.0/24", "me.example.com".
    Ext Ports - The ports to be forwarded, as seen from the WAN. Ex: "2345", "200,300", "200-300,400".
    Int Port (optional) - The destination port inside the LAN. If blank, the destination port is the same as Ext Ports. Only one port per entry is supported when forwarding to a different internal port.
    Int Address - The destination address inside the LAN.
  • #12 17238488
    makosuu
    Network and Internet specialist  
    Posts: 2984
    Help: 369
    Rate: 370
    In ext port e.g. 81 or 8833 or whatever in int port 81 and int adress is the IP of the internal driver.
  • #13 17238566
    Tomis
    Level 14  
    Posts: 204
    Rate: 6
    What about src address? It's from an external network, how should I check it? inserts the DDNS / IP of the driver into the browser? or port
  • Helpful post
    #14 17238574
    makosuu
    Network and Internet specialist  
    Posts: 2984
    Help: 369
    Rate: 370
    If I did not write anything in the src address, nothing should be there :) . You have (optional) in brackets. You have to check from the external network by typing in the DDNS browser: 81 or what ext port you have chosen
  • #15 17238605
    Tomis
    Level 14  
    Posts: 204
    Rate: 6
    OK, yes, yes, yes, thanks you are great, one redirect still had to be added because I also have the UDP port of the driver and it worked, I enter ddns and port and it works
| New topic
Report a violation of the law

Topic summary

✨ The discussion revolves around configuring DDNS with NO-IP on an Asus RT-N18U router connected to a Horizon UPC decoder. The user seeks assistance in setting up DDNS, as they are unable to establish a connection. Responses suggest that the Horizon device may not support bridge mode and that the Asus router might not enable DDNS with a private WAN address. Recommendations include setting a DMZ on the Horizon to the Asus WAN address and ensuring proper port forwarding from the Horizon to the Asus router. The user later confirms that after adding a UDP port redirect, the DDNS setup works successfully.
Generated by the language model.

FAQ

TL;DR: To expose services behind a UPC Horizon + Asus RT‑N18U, use 1 DMZ on Horizon and 2 port rules on Asus; “DMZ to Asus’s WAN address and do redirection on Asus.” Test via DDNS:port from outside. [Elektroda, makosuu, post #17238431]

Why it matters: This helps UPC Horizon and Asus RT‑N18U/Tomato users fix NO‑IP DDNS access and reach LAN services without bridge mode.

Quick Facts

  • Workaround: Set Horizon DMZ to the Asus WAN IP, then create port forwards on Asus/Tomato. [Elektroda, makosuu, post #17238431]
  • RFC1918 private IPv4 ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16; these aren’t Internet‑routable. [“RFC 1918 — Address Allocation for Private Internets”]
  • Testing: Leave “Src Address” blank; verify from an external network using hostname:port (e.g., yourhost.no‑ip.org:81). [Elektroda, makosuu, post #17238574]
  • Some services need both TCP and UDP; adding a second UDP rule made it work in this case. [Elektroda, Tomis, post #17238605]

How do I fix DDNS not working with UPC Horizon + Asus RT‑N18U?

Use this sequence. 1) Note the Asus WAN IP. 2) On Horizon, set DMZ to that Asus WAN IP. 3) On Asus/Tomato, create port forwards to your device. “In Horizon only DMZ to Asus’s WAN address and do redirection on Asus.” [Elektroda, makosuu, post #17238431]

Which IP should I enter in the Horizon DMZ field?

Enter the WAN IP of your Asus RT‑N18U (from its status page). DMZ on Horizon must target that exact WAN address so inbound traffic reaches Asus. [Elektroda, makosuu, post #17237791]

What do I put in Tomato’s Ext Ports, Int Port, and Int Address?

Set Ext Ports to the public port you’ll use (e.g., 81). Set Int Port to the device’s service port (e.g., 81). Set Int Address to the device’s LAN IP. This maps external 81 to internal 10.x.x.x:81. [Elektroda, makosuu, post #17238488]

Do I need to fill the “Src Address” field in Tomato?

No. It’s optional and restricts who can connect. Leave it blank while testing. Verify from an external network using hostname:port to confirm reachability. [Elektroda, makosuu, post #17238574]

It still doesn’t work after setting DMZ—what am I missing?

Create port forwards on the Asus too. Forward the needed TCP ports, and add UDP if required. In this case, 2 rules (TCP + UDP) were needed before DDNS:port worked. [Elektroda, Tomis, post #17238605]

Is it normal that Horizon’s Internet Status IP matches my NO‑IP hostname?

Yes. That’s expected. It shows your hostname resolves to the same public IP Horizon reports, which is correct for DDNS. [Elektroda, makosuu, post #17237932]

Do I need IPv4 for this, and what about IPv6?

The working setup used IPv4. Prioritize IPv4 for these port‑forward steps. As one expert asked, “Got IPv6 or IPv4?” Check what your ISP provides before configuring. [Elektroda, makosuu, post #17237932]

Should I also forward ports on Horizon if DMZ is enabled?

No. DMZ already forwards all inbound ports from Horizon to the Asus. Create per‑service port forwards only on the Asus. [Elektroda, makosuu, post #17237932]

Does pinging my DDNS hostname prove the setup works?

Not necessarily. ICMP ping can fail even when the service is reachable. Test the actual service by opening hostname:port in a browser. [Elektroda, Tomis, post #17238381]

What if my Asus WAN IP is private (e.g., 10.x.x.x or 192.168.x.x)?

DDNS will update, but inbound connections won’t reach your LAN. Use Horizon’s DMZ to the Asus WAN or request a public IP from your ISP. [Elektroda, makosuu, post #17237775]

Edge case: My ISP uses CGNAT (100.64.0.0/10). Will this work?

No. CGNAT blocks unsolicited inbound connections. You’ll need a public IPv4, a VPN, or IPv6 with proper firewall rules. 100.64.0.0/10 is the CGNAT space. [“RFC 6598 — Shared Address Space for Carrier‑Grade NAT”]
Generated by the language model.
ADVERTISEMENT