Siemens SL2-141 User Manual page 66

ADSL Router User Manual
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Check the network information. Make sure the settings match the settings provided by ISP.
Click Finish.
Set TCP/IP for your computer. Specify an IP Address, subnet mask and set default gateway. eg:
IP Address: 10.3.75.51
Subnet Mask: 255.255.255.248
Gateway: 10.3.75.49
Now the router is well configured. You can access into Internet.