Can my landlord access the things on my personal router's network because he controls the upstream connection? For example: the DLNA on my NAS, a public file share on my NAS, or the media server running on my laptop?
My configuration: I have my own router and connected to it are a NAS (wired) and a laptop (wireless.) The INTERNET/WAN port on my router is plugged into a LAN port on my landlord's router. The INTERNET/WAN port on my landlord's router goes to the cable modem. I am the only one with access and the password to my router. I don't have access or the password to my neighbor's router or the cable modem.