Billion(NanJing) BiGuard 50G is a powerful network security device with features including comprehensive support for virtual private networks, advanced firewall, intelligent bandwidth management, load balancing and failover, diverse working modes, advanced NAT functionality, and support for SIP phones and IPTV.
This manual introduces the BiGuard 50G firewall router, describing its key features such as full IPsec VPN support, high‑capacity NAT, SIP and IPTV handling, and multiple operating modes (router, transparent, hybrid). It also explains the hardware specifications, panel indicators, and basic concepts of WAN/LAN interfaces.
Detailed sections cover panel description, port status indicators, reset procedure, WAN/LAN configuration, VPN and QoS settings, logging, and troubleshooting steps. The document ends with configuration examples, saving settings, and a glossary of networking terms. This manual is written in Chinese.
| NAT table capacity | 4 K entries |
|---|
The NAT table can hold up to 4 K entries.