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ZYWALL USG 20 SEC GTW 2 VPN TUNNEL The ZyWALL USG-20 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) 20 provides greater 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.