There's nothing in your router's firewall that would block the eth0 network from switch0's, unless for some reason the firewall thinks that the NAS is "streaming media".
That being said, if you're using it, Windows 7/8/10 ships with a firewall that by default doesn't like going to local subnets that it's not a part of (so, from 192.168.1.0/24 to 192.168.2.0/24 in your setup)