DDNS with Asus Router

[sinanx]

I want to use DDNS for my Home Assistant to be reached from outside, so I bought an Asus RT-AX53U. I have Full Fibre, I removed Sky router and I connected cable from ONT unit directly to Asus Router WAN input. Wifi etc works fine.

When I try to set DDNS from Asus router settings, its says the Router is behind another router and has a private IP, requiring port forwarding from parent router. In this case I assume router sees ONT as parent modem. Is there a way to use DDNS in this setup?

[TimmyBGood]

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@sinanx wrote:

 In this case I assume router sees ONT as parent modem. 

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I think that's incorrect: while an ONT is indeed a modem, it doesn't do Network Address Translation or have IP functionality (i.e. it's specifically not a 'router')

[sinanx]

Thanks Timmy. BTW with Sky Router, the connection from ONT is goint to a LAN port. I used WAN port of the Asus Router. might this be the problem?

Or is there any other way to set up DDNS with Sky Full Fibre?

[cookiemonsteruk]

@sinanx 

The asus has a seperate blue wan port whilst with the skyhub you sacrifice a lan port by plugging into lan port 4

[TimmyBGood]

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@sinanx wrote:

BTW with Sky Router, the connection from ONT is goint to a LAN port. 

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By definition eth #4 is acting as a WAN port when connected an ONT: it has to for the broadband to work.  They've just saved some money in manufacturing by using a standard four port ethernet module.

[jamesn123]

@sinanx 

What WAN IP is your Asus router showing? (Obviously dont post the IP on the forum but is it a public or private one)

[sinanx]

Thank you all for the answers. I guess it was a transient issue. I reconnected the cables again and now it is working.