I would really appreciate if someone knows if i have two Deco's x20 DSL routers, one of them connected to the DSL line and the other just acts as additional (connected) mesh router with its DSL line not connected, can these units works together and acts as a mesh network?

Is one of them needs to be configured as 'master' and the other as 'slave' or something like that?

i know i can buy only 1 x20 DSL and the other X20 no dsl but i have a great deal on 2 DSL devices and also needs the 4 ports each that they provide (opposed to only two in the regular x20 device).

Thanks