@Guyldr 

If you have a main Deco and a satellite Deco in the same mesh, you can certainly use an Ethernet cable to directly connect the main Deco and the satellite Deco.

  @yves_b 

It's still show me wireless connected 

I must to say no isp service . I don't use external network . 

I use deco for internal network to connect clients . 
 

and I plug-in cable between main to satellite Deco. .

 

  @Guyldr Is the Deco Operational Mode AP or Router?

  @yves_b 

router 

  @Guyldr Does it behave better in AP mode?

  @yves_b 

I don'tdon't have other router. 

i have 3 X60

I USE 1 for router. i try connect with cable . but it's connect wireless . why ? 

  @Guyldr Could you not test in AP mode?

I suspect that, in Router mode, the main Deco attempts to determine where (on which Ethernet port) is the connection to Internet.  It might be waiting to determine that before using the other Ethernet ports to connect to other Decos.

  @Guyldr 

Hi

We do not recommend you use Deco in this manner. Deco might function for a brief period of time if its front end is not connected to an ISP or modem. However, in the long run, Deco APP management may regularly face issues such as being unable to find Deco.

The WAN/LAN adaption of the main Deco will frequently do WAN detection on the two Ethernet ports if it is not connected to an ISP service. As a result, both Ethernet ports will be used as possible WAN ports. Ethernet Backhaul between the main Deco and satellite Deco is currently difficult to achieve.