What are the differences between MetaDefender Optical Diode Back-to-Back and the Bilateral Security Gateway functionality?

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This article applies to MetaDefender Optical Diode version 1.11.0 or higher.

This document provides a summary of the main differences between BSG and Optical Diode back-to-back functionality.

	Optical Diode Back-to-back	Bilateral Security Gateway
Connections	Allows connections to be initiated from either side of the network(e.g. low-to-high or high-to-low)	Connections can only be initiated from one side of the network. Typically from high-to-low. BSG is designed for going high to low. It is not recommended for low to high.
Ports	Ports cannot be dynamic	Allows for dynamic ports
Applications	Good for: RDP SSH HTTP - API Calls. No Redirects. WSUS (local connection)	Depending on how WSUS system is setup (pulling files from low into high, it is a preferred, more secure, solution. Ideal solution for MS SQL & historian replication.
Of appliances	4 1 Pair set low-to-high 1 Pair set high-to-low	2 1 pair typically configured high-to-low.

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