Draytek 2750 manual 144

zEnhance security of the internal network by obscuring the IP address. There are many attacks aiming victims based on the IP address. Since the attacker cannot be aware of any private IP addresses, the NAT function can protect the internal network.

On NAT page, you will see the private IP address defined in RFC-1918. Usually we use the 192.168.1.0/24 subnet for the router. As stated before, the NAT facility can map one or more IP addresses and/or service ports into different specified services. In other words, the NAT function can be achieved by using port mapping methods.

Below shows the menu items for NAT.

4.4.1 Hardware NAT

Hardware-base Acceleration Engine, also named Protocol Processing Engine API is the function that Draytek provides to extremely speed up the NAT performance.

While the hardware acceleration mechanism is activated, most of the bandwidth usage will be concentrated on the specific sessions which increase transmission speed to get ultimately accelerated.

4.4.2 Open Ports

Open Ports allows you to open a range of ports for the traffic of special applications.

Common application of Open Ports includes P2P application (e.g., BT, KaZaA, Gnutella, WinMX, eMule and others), Internet Camera etc. Ensure that you keep the application involved up-to-date to avoid falling victim to any security exploits.

To add a new open port, click Add new entry.

144 Vigor2750 Series User’s Guide