Hi  @amartingil，

May I know if your network topology diagram is as follows:
Modem—Archer AX55 in AP mode )))((( client devices
(Note: — stands for wired connection,)))((( stands for wireless connection )

If the above topology diagram is correct, it means that the modem has obtained the public network IP and the modem has acted as a gateway.

If you do not change the router to Access Point mode, the router configuration only needs to select Dynamic IP, and does not need to configure talktalk information.

If you want Archer AX55 to obtain the public IP, you can consider adjusting Archer AX55 to the front and directly connect to the network source of talktalk. Or, set the modem to bridge mode.

  @Joseph-TP 

The topology I'm trying is the following:

ONT modem (broadband source)- Archer AX55 (router mode - dynamic ip)- Laptop 

The archer's admin settings page shows that it's trying to connect but the ip remains 0.0.0.0 indefinitely 

If I do:

ONT (network source) - Sagemcom( Talk talk router) - Archer AX55 ( AP mode) - Laptop 

Works well, but I lose all enhanced network management benefits by no replacing the Sagemcom router by the tp link.

I don't now if it's possible to set up the sagemcom as bridge. 

Hi  @amartingil,

Generally, your ISP talktalk provides different Internet connection types, such as PPPoE, you will have to manually configure it to obtain Internet.

It is recommended that you can confirm the internet connection types with talktalk.