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Whether the IPSec feature of the USG5000 supports hot standby in load balancing mode

The IPSec feature does not support load balancing on USGV300R001 and starts to support load balancing since NGFWC10.

USGs of all models support hot standby.

Search for "Connecting to the Internet through multi-ISPs (hot standby)" in the USG6000 product documentation.

Search for "Connecting to the Internet through multi-ISPs (hot standby)" in the USG2000/5000 product documentation.

IPSec does not support load balancing in USG V3R1. It will support load balancing in NGFW C10 and later versions.