I have a TP Link AC1900 Router.  I have noticed recently when viewing my Open DNS Log that there is an entry "tplink.Repeater".  I a not certain what I an looking at when I see this but I do not use my router as a repeater, although it has the capability to be used as a repeater, as well a repeater can be added.  I have personal concerns about this and I want to block a repeater being attached to my home network, or block my router from becoming an extender or repeater.  Is there a way to block this from happening if you are not aware what device is being added to change my router's function.  

Thanks, 

Chris