Manual Draytek Vigor 2100VG series (page 44 of 134) (English)

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Vigor2100V series

5-1

Chapter 5

NAT Setup

5.1 Introduction

NAT is a method of mapping one or more IP addresses and/or service ports

into different specified services, where NAT stands for Network Address

Translation. It allows the internal IP addresses of many computers on a

Local Area Network (LAN) to be translated to one public address, saving

users’ cost. It also plays a security role by obscuring the true IP addresses

of important machines from potential hackers on the Internet. For

convenience, we called a router having the NAT facility as a NAT-enabled

router.

Usually you will use your Vigor router as a NAT-enabled router. The

NAT-enabled router gets one globally re-routable IP address from the ISP and

assigns private network IP addresses defined by RFC-1918 to local hosts.

The NAT-enable router translates the private network IP addresses to such a

globally routable IP address so that local hosts can communicate with the

router and access the Internet.

5.2 NAT Setup

Click NAT Setup to open the setup page. On the 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. Also, 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

method.

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Draytek Vigor 2100VG series Manual

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