about simultaneous when using mysql and freeradius

1 Jun 2010

      i want to limit user's behavior, such as a username can login only once at
the same time...

1、modifiy default and inner-tunnel in

#  Session database, used for checking Simultaneous-Use. Either the radutmp
#  or rlm_sql module can handle this.
#  The rlm_sql module is *much* faster
session {
        #radutmp

        #  See "Simultaneous Use Checking Querie" in sql.conf
        sql

}
2、modify dialup.conf in etc/raddb/sql/mysql

# Uncomment simul_count_query to enable simultaneous use checking

simul_count_query = "SELECT COUNT(*) \
                            FROM ${acct_table1} \
                            WHERE username = '%{SQL-User-Name}' \
                             AND acctstoptime IS NULL"

3、add a entry to the table radgorucheck
INSERT INTO `radgroupcheck` ( `id` , `GroupName` , `Attribute` , `op` ,
`Value` )
VALUES (
NULL , ’user’, ’Simultaneous-Use’, ’:=’, ’1’
);

4. update the user "test"  to the group "user"

i finally tried successfully, but if , i say if the radius server was down
suddenly or the user logout improperly(such as he poweroff the computer
directly). then the record will still be record in the table as he was still
online ...so we need to modify the record, but how to ? can freeradius judge
it by itself, or how to judge the user if offline ?

-- 
Spacelee

-- 
Spacelee