Basically you need to Install iodbc on your linux System.
You can find the RPM at www.iodbc.org or www.unixodbc.org.
To Create DSN on Redhat 7.0 Use KDEODBCCONFIG .
Itz Same as that you find in Windows.
I am on the Trials of Configuring the same stuff on Redhat 6.2.
Lemme know if you are Successfull.
Best Regards,
Sudeep Kumar