Draytek Vigor2000 User Manual page 41

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3.1.2 Configuring Ethernet TCP/IP Address and DHCP Server
Vigor2000 Router has six Ethernet ports for connecting to the local
Ethernet network and external broadband device (i.e. DSL modem/
router or Cable modem).
There are two sets of IP address settings for the Ethernet. The 1st IP
address/netmask is for private users or NAT users, and the 2nd IP
address/netmask is for public users or pure router (not NAT) user. To
allow access of public users you need to subscribe a globally
reachable subnet from your ISP.
For example, for some ISDN dial-up access, the ISP will assign a few
public IP addresses for your local network usage. You could use one
IP address for your router; the 2nd IP address/netmask should be
configured using the public IP address. Other local PCs should set
the router IP address as the default gateway. When the ISDN con-
nection to the ISP has been established, each local PC will directly
route to the Internet. Also, you could use the 1st IP address/netmask
to connect to other private users (PCs). These user's IP addresses
will be translated to the 2nd IP address by the router and sent out via
ISDN.
Basic Setup & Internet Access
3-3