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ZYWALL USG 20W SEC VPN WLS N GTW The ZyWALL USG 20W series is a high-performance, deep packet inspection anti-spam features in one box. The multi-layered security safeguards your organization's customers and company records, intellectual property as well as critical resources from external and internal threats. The ZyWALL USG (Unified Security Gateway) 20W provides great performance protection as well as a deep packet inspection security solution for small businesses to enterprises alike. It embodies a Stateful Packet Inspection (SPI) firewall, content filtering, anti-spam, and VPN (IPSec/SSL) in one box.