I don't have my HDDs hooked up to a router. What I have is the following :
Modem>Airport Extreme router>LAN>Switch>LAN>Switch>ReadyNAS with 5 drives + ReadyNAS with 2 drives.
Accessing the ReadyNAS by LAN are 2x Win7 PCs, 3x NeoTV video streamers and 6x Sonos audio streamers.
Accessing the ReadyNAS by WiFi through the AExtreme are 2x iPhones, iPad and MacBook Air.