D-Link DWS-3160 Configuration Manual page 11

How to Configure a BYOD Environment with the DWS-3160
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service postgresql restart
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5-2-3. Import FreeRADIUS schemas.
Create a default group and insert a test user into the database. Please copy the schema.sql file
which provide by D-Link to replace the existence one under /etc/raddb/sql/postgresql/.
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cd /etc/raddb/sql/postgresql/
chown root:radius schema.sql
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Use the command below to create the table schema for database.
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sudo cat /etc/raddb/sql/postgresql/schema.sql | psql -U radius radius
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5-2-4. Set the default attribute to the default group.