wndr3700v3 guest network allows access to my private network

OK, well I tried using the wndr3700v3 as a repeater for my exisisting Netgear N300 Model C2000 and it was pretty much of a bust.  The manual that shipped with the wndr3700 was useless as it did not have anything about using it as a repeater.  When I googled how to do it, I saw that it would limit me to only WEP encryption, so I decided that I would just live with the range limitations of having the main router in my office.  And I could never get the repeater to work at all.

I think if I ever get serious about it, I will buy a pair of Orbi routers (master,slave), disable the wireless function of the router in my office.  Then I could put the master Orbi and the slave in my living room so I could then have a really private LAN and wireless access for my guests.  For now the guests will just have to do with less than perfect wireless in the living room.

vern