EXPERT RESPONSE
Companies that do not implement true IPsec often advertise their products as VPN pass-through. Just because the device can pass IPsec does not mean they can fully support it.
Not all products handle IPsec the same way and that is the case with pass-through. Devices that support pass-through break the NAT traversal and usually are limited to only one host behind the firewall.
Multi-tunneling allows the system to discriminate and forward traffic based on destination. Devices that support multi-tunneling can connect VPN users and sort each of them into their own establishment tunnel.
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