Whether the firewall supports transparent mode

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The USG2000&5000&6000 support transparent mode.

Other related questions:
Whether USG2000&5000 series virtual firewalls support transparent mode
The virtual firewall supports transparent mode. You can bind virtual firewalls in transparent mode to VLANs one by one to isolate addresses on the same network segment.

Definition of transparent mode for the firewall
For the firewall, the transparent mode is a common deployment mode. The service interfaces of the device work at Layer 2 (data link layer) to forward Layer 2 packets. In this case, the device can serve as a switch and can perform security protection on the traffic without changing the original network structure and configuration after being connected to the original gateway device in transparent mode. Therefore, this deployment mode is usually called the "transparent mode".

Whether the firewall supports source NAT in transparent mode (service interfaces working in switching mode)
Yes. However, the post-NAT source address can use addresses in the address pool, but not addresses of outbound interfaces.

Whether the USG5000 supports configuring IPSec point-to-point interconnection in transparent mode
The device does not support configuring IPSec point-to-point interconnection in transparent mode.

Whether USG firewalls support the BFD
USG firewalls support the BFD.

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