D-Link DFL-900 User Manual page 32

Part I
Overview
Basically, transparent mode provides the same firewall protection as NAT mode. Packets received by the DFL-1500 are intelligently
forwarded or blocked according to the firewall rules. However, some advanced firewall features are only available in NAT/Route
mode.
Transparent mode will not support the following features currently:
1. WAN PPPoE link
2. Authentication
3. VPN (IPSec / PPTP / L2TP)
4. NAT
5. Routing
6. IP/MAC Binding
7. DDNS / DNS Proxy / DHCP Relay
8. Interface change
9. Show IPSec sessions
10. VPN Logs
D-Link
Figure 1-11 DFL-1500 Transparent mode connections
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