@Tabsi well, it seems you have found your error source. If it says you get dhcp offer from 192.168.10.15, then you have dhcp enabled on 192.168.10.15. Your solution is to disable dhcp server on...

@Tabsi sorry for the few typos above, I mean of course er605, not re650 which would be also another tp-link product (wireless repeater), sadly I cant edit posts.

@Tabsi thanks for the screenshot, if you check which dhcp server gives you IP address, then you know from who you get the ip. in this example, lan address is 192.168.0.7 which is re650's ip, example...

@Tabsi thanks, what I miss on your topology are the subnets/ip's, as I have no clue if they are in any way splitted or isolated, are all your devices from pic in 192.168.0.1/24 range? So far I do not...

@Tabsi can you draw your topology of how your network is connected?

@Tabsi I can assure you that dhcp reservation works and if you renewed the lease and your er605 is connected and has the ip address which you defined in LAN as well as enabled dhcp, then the only 3...