Airlink101 AR675W - Manual (Page 77)

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Enable IPsec pass through Check this box and the router will enable IPsec packets
On VPN connection pass through the router for VPN connection.
Enable PPTP pass through Check this box and the router will enable PPTP packets
On VPN connection pass through the router for VPN connection
Enable L2TP pass through Check this box and the router will enable L2TP packets
On VPN connection pass through the router for VPN connection.
Click <Apply Changes> at the bottom of the screen to save the above configurations.