Hello I bought my 4° tp-link Archer. My idea is to use it as a router and to create a new wi-fi settings for my home. I like to have a static ip for this kind of router, such as the one I laready have. But in this new version I'm able to set static ip and subnet mask but no chance to put default gateway, such as I did for the other ones (Archer C6 v2), and in the router section it sets the default gateway such as the same itself ip. Of course, ethernet and wireless devices can surf the web but the router cannot go online, so cannot chech firmware upgrade, ntp time etc.. I tried to add a new routing line, too, practically the same as the previous one with a different and correct gateway but I receive: 

The IP address and the LAN IP address cannot be in the same subnet. Please enter another one.

Thank you

Antonio