Draytek Vigor2860 Series User Manual page 407

3. Click the Details Page of WAN 1 to open the following page. From the above figure, set
main WAN IP address as 172.17.1.53.
Click the WAN IP Alias button to configure the other two IP addresses which are
172.17.1.55 and 172.17.1.57. Make sure Join IP NAT Pool is not checked.
The outgoing traffic is routed to WAN1 port or WAN2 port according to the
Load-balance policy. When the traffic is routed to WAN1 port, by default WAN1 main
IP address (172.17.1.53 in this example) is used to replace the source private IP address.
Therefore, all the client IP addresses will be transmitted to 172.17.1.53 by default.
Since you have additional IP addresses on WAN1 connection, you may want some of the
internal PCs be presented to the Internet with different IP addresses. In this example, the
server with IP address 192.168.1.11 is to be presented to the Internet as 172.17.1.57 and
the computers with a block of IP addresses from 192.168.1.16 through 192.168.1.31 are
to be presented as 172.17.1.55.
4. Click OK to save the settings.
397 Vigor2860 Series User's Guide