@David-TP The network layout is: Internet---Sagemcom F-3890v3---main Deco X20---TL-SG108---1*Deco X20s I don't have customized DNS server in the LAN network, like Pi-Hole. This would be help? I have...

I have connection problem with next combo: Sagemcom F-3890v3 TL-SG108 Deco X20 V1 (x2) I think that problems related IP-address and DNS settings. Can somebody tell step by step how I set all...