Draytek Telnet Command 1.11 - Manual (Page 28)

Telnet Command Reference Guide V1.1 22
2.4.14 ip wan2addr
This command allows users to set second WAN address for the router.
ip wan2addr [IP address][IP netmask]
Syntax Description
IP address It means the WAN IP address.
IP netmask It means the netmask of the specified IP address.
gateway ip It means the IP address for gateway.
Example
>ip wan2addr 172.16.2.4 255.255.255.0
% Set WAN IP address OK!!!