i was wondering if an attacker or intruder can probe a network , home especially, for its devices connected, or is NAT going to prevent that from happening?

hi i'm trying to setup tftpd64 for transferring across platforms, for windows, linux and iOS.   is this a good program to use ?   i'm already having issues between my windows pc and linux laptop.  it's connecting but timing out grabbing files.or, any...