Asus DSL-N13 - Manual (Page 29)

DSL-N13 Wireless ADSL 2/2+ Modem Router User Manual
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WDS setup (DSL-N13)
1. Setting up encryption
If you want to use encryption function, select a Network Authentication mode; if not,
select Disabled. Click Wireless -> Security to open the configuration page.
In this example, set authentication to Open and encryption to Enabled, select 128bit for
Encryption Strength, then click Set Encryption Keys.