Specifications

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Link:
IPSec
When you click on the IPSec link, the IPSec configuration screen appears.
Your Gateway can support two mechanisms for IPSec tunnels:
IPSec PassThrough supports Virtual Private Network (VPN) clients running on LAN-
connected computers. Normally, this feature is enabled.
You can disable it if your LAN-side VPN client includes its own NAT interoperability
option. Uncheck the
Enable IPSec checkbox.
IPSec VPN
A VPN IPSec Tunnel provides a single, encrypted tunnel to be terminated on the Gateway,
making a secure tunnel available for all LAN- connected users. This implementation offers
the following:
Eliminates the need for VPN client software on individual PCs.
Reduces the complexity of tunnel configuration.
Simplifies the ongoing maintenance for secure remote access.