Tz670SonicWall TZ670 Network Security Firewall Appliance The SonicWall TZ670 Network Security Firewall Appliance is a purpose built NGFW designed for mid sized organizations and distributed enterprises that demand robust, enterprise grade protection without sacrificing office friendly form and performance. Engineered to deliver uncompromising security with a compact desktop footprint, the TZ670 blends advanced threat prevention with high speed networking