ADSL Router User Manual
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Check Configure the second IP Address and Subnet Mask for LAN
Interface and enter the information needed, e.g.,
Secondary IP Address: 10.3.80.81
Subnet mask: 255.255.255.248
Click Next.
Check the network information on the Summary page. Make sure the contents
match the settings provided by your ISP. Click Finish.
Now the IAD is well-configured. You can access the Internet.