Siemens SLI-5310 - Manual (Page 64)

ADSL Router User Manual
7. 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.
8. Check the network information on the Summary page. Make sure the contents
match the settings provided by your ISP. Click Finish.
9. Now the IAD is well-configured. You can access the Internet.
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